heliotrineThe alkaloid [(7S,8R)-7-hydroxy-5,6,7,8-tetrahydro-3H-pyrrolizin-1-yl]methyl (2S)-2-hydroxy-2-[(1R)-1-methoxyethyl]-3-methylbutanoate present in the heliotrope Heliotropium europaeum
heliotronA stellarator in which a helical coil is used to confine the plasma, together with a pair of poloidal field coils to provide a vertical field.
heliotropeA plant with flowers which turn to face and follow the sun, such as (archaic) marigolds and sunflowers.
heliotroperThe person at a geodetic station who has charge of the heliotrope.
heliotropianRelating to, or made from, heliotrope or bloodstone.
heliotropismThe property of some plants of turning under the influence of light; either positively (towards the light) or negatively (away from the light).
heliotypographyA technique for producing of a print of sunspots from a photographic negative using a typographical press.
heliotypyA method of transferring pictures from photographic negatives to hardened gelatin plates from which impressions are produced on paper as by lithography.
helioxA mixture of helium and oxygen used as a breathing gas.
helioxanthinAny of a group of benzofurans (especially 10-(1,3-benzodioxol-5-yl)-9H-[2]benzofuro[6,5-g][1,3]benzodioxol-7-one) that suppress gene expression of human hepatitis B virus
heliportA facility, such as a small airport, designed to let helicopters take off and land.
heliportableCapable of being conducted using helicopters for transport.
helipyroneThe dimeric lactone 6-ethyl-3-[(6-ethyl-4-hydroxy-5-methyl-2-oxopyran-3-yl)methyl]-4-hydroxy-5-methylpyran-2-one present in several herbs and spices
heliumThe second-lightest chemical element (symbol He), with an atomic number of 2 and atomic weight of 4.002602, a colorless, odorless and inert noble gas.
heliumlikeHaving the electronic structure of a helium atom
helixA curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant; the three-dimensional curve seen in a screw or a spiral staircase.
HelleA daughter of king Athamas, who, together with her brother Phrixus, fled from their stepmother Ino to Colchis on a golden ram. On their way, she fell from its back and was drowned in the strait called, after her, Hellespont.
helleboreAny of the common garden flowering plants of the genus Helleborus, in family Ranunculaceae, having supposed medicinal properties.
Hellenthe mythological patriarch of the Hellenes, the son of Deucalion (or sometimes Zeus) and Pyrrha, brother of Amphictyon and father of Aeolus, Xuthus, and Dorus
HellendoornA village and municipality of Overijssel, Netherlands.
HellenicistA linguist or philologist who specialises in studying Hellenic languages, chiefly Ancient Greek.
HellenicityThe quality or condition of being ancient Greek
HellenisationThe adoption of Greek manners and culture
HellenismAny of the characteristics of ancient Greek culture, religion, civilization, principles and ideals, including humanism, reason, the pursuit of knowledge and the arts, moderation and civic responsibility.
HellenistA specialist in the study of Greek language, literature, culture, or history, or an admirer of the Greek culture and civilization.
HellenisticOf or pertaining to the period of the Greek culture, history, or art from after the death of Alexander the Great (323 BCE) to the defeat of Cleopatra and Mark Antony by Octavian (31 BCE—though this is often debated, and can range from 146 BCE to 330 CE [*]).
hellgrammiteThe aquatic larval form of the dobsonfly, having a segmented body with legs on each segment, and a head with prominent pincers, prized as fish bait.
hellholeA place of intense hatred, misery, or turmoil.
hellhoundA demonic dog of hell, typically of unnatural size, strength or speed, with black fur, glowing eyes, and ghostly or phantom characteristics.
HellidonA village and civil parish in Daventry district, Northamptonshire, England (OS grid ref SP5158).
hellierOne who heles or covers; hence, a tiler, slater, or thatcher.