Words starting with H

helicosporeAny fungal spore that has the form of a cylindrical coil (helix)
helicosporidianAny green alga of the genus Helicosporidium
helicosporousRelating to helicospores.
helicotremaThe part of the cochlear labyrinth where the scala tympani and the scala vestibuli meet.
helicraneA heavy-lift helicopter.
helicticalHaving the form of a helix; helical
helictiteA speleothem found in limestone caves that changes its axis from the vertical at one or more stages during its growth.
helictoglossaThe end of a raphe, in some diatoms, in the form of a rolled tongue or a pair of lips
helicultureThe farming of (typically edible) snails
helideA binary compound of helium and another element.
helideckA platform (on a vessel or offshore structure) allowing helicopters to land and take off.
helidromeAn airfield or airbase for helicopters.
HeliesA surname from Breton.
heliettinA furocoumarin with IUPAC name (±)-3-(1,1-dimethylallyl)-6,7-dihydro-7-(1-hydroxy-1-methylethyl)-2H-furo-[2,3-g]-1-benzopyran-2-one.
HeligolandA small island of Schleswig-Holstein, Germany in the North Sea.
HeligolanderA native or inhabitant of Heligoland, an archipelago part of the state of Schleswig-Holstein, Germany.
HeligolandicA dialect of the North Frisian language spoken on the German island of Heligoland in the North Sea.
HeligolandishOf or relating to Heligoland.
helijetA flying vehicle resembling a helicopter and/or a jet.
HelikeAn ancient Greek city that was submerged by a tsunami in 373 BC.
HelikianAn age from 1600 to 850 million years ago, a subdivision of the Proterozoic.
helikiteSynonym of kytoon.
heliliftTo transport (troops) by helicopter.
helimagnetAny material that exhibits helimagnetism
helimagneticOf, pertaining to, or produced by helimagnetism
helimagnetisma property of some metals and of some salts of transition elements at low temperature in which the atomic magnetic moments are arranged in a helix
helimanA soldier who serves in a helicopter.
helimeraseAn enzyme that functions both as a helicase and a DNA polymerase
helioA heliotrope (surveying instrument).
heliobacterialRelating to heliobacteria
heliobacteriumAny of the Heliobacteriaceae, a family of photoheterotrophic bacteria, using bacteriochlorophyll to convert light energy into chemical energy, exclusively in anaerobic conditions
heliobiologyThe (study of the) effect of solar activity on life (both animal and plant)
heliocentricHaving the sun at the center/centre; usually in reference to a coordinate system or orbit.
heliocentricallyIn a heliocentric manner.
heliocentricityThe quality of being heliocentric; heliocentrism.
heliocentrismThe theory that the Sun is the center of the universe.
heliochemistryThe study of the chemical elements present in the Sun.
heliochromeA photograph representing an object in its natural colours.
heliochromicPertaining to, or produced by, heliochromy.
heliochromismThe property of certain photochromic materials of colouring in near-ultraviolet light and then fading in its absence; they are used in the lenses of sunglasses
heliochromoscopeA device for combining three specially taken black-and-white photographs so as to produce a color image.
heliochromotypeA heliochrome; a photograph in natural colours.
heliochromyThe art of producing colour photographs, especially using a certain, now obsolete, technique.
heliocideAny of a group of sesterterpenoid insecticides present in cotton (Gossypium hirsutum)
heliodinidAny moth in the family Heliodinidae.
heliodonA mechanical device, used in architecture, for demonstrating the sun's motion relative to a building.
heliodorA richly coloured form of golden beryl found in southwest Africa.
HeliodorusA male given name.
helioelectricDescribing electric power generated by the rays of the sun.
helioelectricalOf or pertaining to helioelectricity.
helioelectricityA form of electric power that is generated or harnessed by the rays of the sun.
helioflagellateA freshwater protozoan of the class Zoomastigophorea.
helioformSun-shaped.
HeliogabalianRelating to Heliogabalus.
HeliogabalusSynonym of Elagabalus (“Roman emperor, noted for decadence, eccentricity, femininity, and disregard for Roman religious traditions and sexual taboos”).
heliogeomagneticsThe (study of) geomagnetic activity of the sun
heliogeophysicalRelating to the effects of solar activity on geophysics
heliogramA message transmitted by a heliograph.
heliographAn apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.
heliographerOne who signals by heliography.
heliographicOf or pertaining to heliography; transmitted by heliograph
heliographicalRelating to heliography.
heliographicallyBy means of heliography.
heliographyThe scientific study of the Sun.
heliogravurerotogravure (process or engraving)
heliohydroelectricThat which generates electricity by tapping the refilling flow of water into a basin emptied by solar-enhanced evaporation.
heliohydroelectricalOf or pertaining to heliohydroelectricity.
heliohydroelectricityA form of hydroelectricity in which the head of water is maintained by solar evaporation from a lower reservoir.
heliolaterA sun-worshipper.
heliolatitudeA latitude described in terms of solar coordinates.
heliolatitudinalRelating to heliolatitude.
heliolatrousThe worshipping of the Sun.
heliolatryThe worship of the sun as an actual religion or mythos.
helioliteA variety of feldspar, closely related to orthoclase
heliolithicof a civilization characterized by megaliths and sun-worship
heliolitidAny extinct marine invertebrate of the suborder †Heliolitida, typically encountered as fossils
heliologicalRelating to heliology.
heliologistOne who studies heliology.
heliologyheliophysics
heliolongitudeA longitude described in terms of solar coordinates.
heliolongitudinalRelating to heliolongitude.
heliomagneticOf or pertaining to heliomagnetism.
heliomagnetismthe magnetic field, and associated activity, of the sun
heliometerAn astronomical instrument, based on a telescope, for measuring the diameter of the sun; now used to measure the angular distance between stars and other celestial bodies.
heliometricOf, relating to, or using, a heliometer
heliometricalheliometric
heliometricallyBy means of, or in terms of, heliometry.
heliometryThe measurement of the diameters of heavenly bodies, their relative distances, etc. by means of a heliometer
heliomicroscopyA form of microscopy that uses a beam of helium atoms focused using a Fresnel zone plate
heliomycinA pentacyclic antibiotic 3,5,7,10-tetrahydroxy-1,1,9-trimethyl-2H-benzo(c,d)pyrene-2,6(1H)-dione.
helionAny helium ion, the nucleus of any helium atom.
helionalThe aromatic aldehyde 3-(1,3-benzodioxol-5-yl)-2-methylpropanal that is used commercially as a fragrance
helionautSomeone who travels to the Sun; an explorer of the Sun.
helioniumAny atomic system containing a helium nucleus and an antihelium nucleus.
heliopauseThe boundary of heliosphere where the Sun's solar wind is stopped by the interstellar medium.
heliophileAny organism that is attracted to sunlight or thrives in it.
heliophiliaThe property of an organism being attracted to sunlight or thriving in sunlight.
heliophilicSynonym of heliophilous.
heliophilousThat needs, or tolerates, a high level of direct sunlight.
heliophobeAny organism that dislikes, or cannot thrive in, sunlight.
heliophobiaFear of sunlight; dislike and strenuous avoidance of direct sunlight (and, in some cases, all sunlight).
heliophobicAverse to sunlight.
heliophobousSynonym of heliophobic (“averse to sunlight”).
heliophylliteAn orthorhombic mineral containing arsenic, chlorine, lead, and oxygen.
heliophysicsThe physics of the Sun and its interactions with objects within the heliosphere
heliophyteAny plant that thrives in bright sunlight
heliophyticThat thrives in bright sunlight
heliopolarRelating to, or measured according to, the poles of the Sun.
HeliopolisThe ancient capital of the 13th nome of Lower Egypt, located in the northern suburbs of modern Cairo, Egypt.
HeliopolitanOf or relating to Heliopolis.
helioporeA coral of the genus Heliopora, the sun coral or blue coral.
helioporidAny in the family Helioporidae of corals
heliopsisAny of the flowering plants of genus Heliopsis.
heliorhodopsinAny of a form of rhodopsin that have a reverse orientation in the cell wall
heliornithidAny finfoot in the family Heliornithidae.
heliosThe god of the Sun; son of Hyperion and Theia, brother of Selene and Eos, father of Phaeton amongst others. His Roman counterpart is Sol.
helioscopeAn apparatus for viewing the Sun without harming the eye, by means of an optical filter that attenuates most of the sunlight while allowing only a small amount of the solar radiation.
helioscopicOf or relating to the helioscope.
helioscopinA particular ellagitannin.
helioscopyThe use of the helioscope.
helioseismicOf or pertaining to helioseismology.
helioseismologicalOf or pertaining to helioseismology.
helioseismologicallyIn terms of helioseismology.
helioseismologistA scientist who studies helioseismology.
helioseismologyThe study of the propagation of pressure waves in the Sun.
heliosheathA zone between the termination shock and the heliopause, in the heliosphere, at the outer border of the Solar System, where the solar wind is dramatically slower than within the termination shock.
heliosisSunstroke.
heliospectrographA spectrograph for use on the Sun
heliosphereThe region of space where interstellar medium is blown away by solar wind; the boundary, heliopause, is often considered the edge of the Solar System.
heliosphericOf or pertaining to the heliosphere
heliostatA device that includes a plane mirror which turns so as to keep reflecting sunlight toward a predetermined target, compensating for the sun's apparent motions in the sky. The target may be a physical object, distant from the heliostat, or a direction in space, and is almost always stationary relative to the heliostat, so the light is reflected in a fixed direction.
heliostaticOf astronomical models of the solar system in which the Earth and planets move, but the Sun does not.
heliosynchronousDescribing an orbit around the Earth where each passage in the same direction along a given latitude will occur throughout the year at the same true solar time.
heliotacticRelating to heliotaxis.
heliotailThe part of the heliosphere opposite to the bow shock
heliotaxisMovement of an organism toward sunlight; positive heliotaxis.
heliothalassotherapyA type of physical therapy that combines aspects of heliotherapy and thalassotherapy, providing therapeutic effects with sea water and sunlight.
heliotheismThe worship of the Sun; the belief that the Sun is a god.
heliotheistOne who practices heliotheism; a sun worshiper; one who believes the sun to be a god.
heliotheisticPertaining to heliotheism; worshipping the sun as a god.
heliotherapeuticPertaining to heliotherapy.
heliotherapistOne who carries out heliotherapy.
heliotherapyAny medical therapy by exposure to light.
heliothermAn ectotherm that obtains its energy by basking in the sun, as butterflies.
heliothermicgaining heat from the sun
heliothermometerSynonym of actinometer.
heliothermyThe condition of being heliothermic
heliothidA moth of what used to be considered the family Heliothidae, but is now the considered the subfamily Heliothinae within the family Noctuidae.
heliothineAny moth of the subfamily Heliothinae
heliotomographyThe three-dimensional analysis of the structure of the sun, especially of convection currents

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