Skip to content A B C D E F G H I J K L M N O P Q R S T U V W X Y Z orthocharmonium The form of charmonium in which the spins of the two quarks are parallel. orthochess The conventional game and rules of chess. orthochlorobenzalmalononitrile The active ingredient in most tear gas, C₁₀H₅ClN₂, also called CS gas orthochoanite Any nautiloid cephalopod of the suborder Orthochoanites orthochoanitic Pertaining to the obsolete cephalopod suborder Orthochoanites. orthochromasia Synonym of orthochromasy. orthochromasy The property of a stain to not change color when binding to something else. orthochromatic Being uniformly sensitive across the entire visible range, and thus reproducing colours faithfully orthochromatism Quality of being orthochromatic. orthochromatize To make orthochromatic orthochromatophilic Describing an erythroblast, derived from a polychromatophilic one, that is approaching the colour of a mature erythrocyte orthochromite Any of a group of mixed oxides of chromium and another metal (typically a rare earth element) of general formula MCrO₃ orthochronous Describing any Lorentz transformation or Galilean transformation which preserves the direction of time orthochrysotile An orthorhombic polytype of chrysotile. orthoclad Any midge of the chironomid subfamily Orthocladiinae orthoclase Potassium aluminum silicate, KAlSi₃O₈, a common feldspar of igneous, plutonic, and metamorphic rocks. Orthoclase is the main feldspar of pegmatite occurrences, where it is most commonly flesh-colored. Orthoclase is used in the ceramic and glass industries and as a decorative gravel. orthoclasic Of or relating to orthoclase. orthoclastic Having cleavage planes at right angles, as in orthoclase. orthocleavage cleavage of 1,2 substituents orthocomplement An element of an ortholattice which is the result of applying an orthocomplementation function to a given element (of that ortholattice) (of which it is said to be the orthocomplement). orthocomplementation An involution on a complemented lattice which is order-reversing and maps each element to a complement. orthocomplemented Having orthocomplementation. orthocone A long straight shell of a nautiloid cephalopod. orthoconglomerate A conglomerate containing mostly clasts orthoconic Having or being a (mollusc) shell which is conical and straight (not curved or spiraled). orthoconoscope Synonym of orthicon. Orthocorybantian Synonym of Massagetean. orthocousin Any of two or more cousins who are the children of siblings of identical gender, i.e. children of brothers or of sisters. orthocresol Ortho isomer of cresol. orthocumulate A cumulate rock in which the groundmass is of different composition to the accumulated crystals. orthocupolarotunda A cupolarotunda in which the bases have the same orientation. orthod A form of orthic spodosol. orthodata Constraints or assessments applied to transactional or warehoused data to assure data quality. orthodenticle A homeobox gene involved in the development of the head. orthodentin A form of dentin, composed of straight tubes, in the teeth of mammals. orthodeoxia accentuation of arterial hypoxemia upon standing upright orthodiagonal Having diagonals that are perpendicular to each other. orthodiagram The record made by an orthodiagraph. orthodiagraph An instrument used to determine the true contour and dimensions of any internal organ or other object rendered visible by X-rays, the latter being deflected so as to be made parallel. orthodiagraphic Relating to orthodiagraphy. orthodiagraphically By means of orthodiagraphy. orthodiagraphy Examination by means of an orthodiagraph. orthodigita A correction of a misalignment of the toes orthodiphenol Any diphenol in which the two hydroxyls are in the ortho position orthodiphenolic Relating to an orthodiphenol orthodome A dome that is parallel to the orthodiagonal in a monoclinic crystal. orthodont Of teeth, pointing downwards. orthodontal orthodontic orthodontia Synonym of orthodontics. orthodontic Of, or relating to the dental speciality of orthodontics. orthodontically By orthodontic means. orthodontics A specialty of dentistry concerned with correcting misalignment of teeth. orthodontist An orthodontic dentist. orthodontology Orthodontics. orthodonture Orthodontics. orthodox Conforming to the accepted, established, or traditional doctrines of a given faith, religion, or ideology. orthodoxality The quality of being orthodox. orthodoxia Correct praise; correct faith. orthodoxian Of or pertaining to Orthodox beliefs. orthodoxic orthodox orthodoxically In an orthodoxical manner. orthodoxism Strict orthodoxy. orthodoxist An advocate of a rigid orthodoxy orthodoxization The process of making orthodox. orthodoxize To render something or someone orthodox. orthodoxly In a correct or proper way; conventionally; correctly. orthodoxness The state or condition of being orthodox. orthodoxy Correctness of doctrine and belief in regard to any doctrinal (i.e. philosophical or theological) system. orthodromal orthodromic orthodrome A great circle, or part of one. orthodromic Of or relating to a means of navigation by following an arc of the great circle corresponding to the shortest distance between two points on the globe. orthodromically In an orthodromic manner orthodromics orthodromic navigation orthodromy Navigation based on calculating the shortest distance between two locations on a globe or sphere. orthoepic Synonym of phonological: concerning the study of pronunciation. orthoepical Synonym of orthoepic. orthoepically In an orthoepical manner: pronounced correctly or in accordance with standard usage. orthoepist An expert at orthoepy: a person who studies the pronunciation of words, especially (historical) one of the orthoepists, 16th- and 17th-century linguists who tried to establish standard English pronunciations and spellings. orthoepistic Relating to orthoepists or to orthoepy orthoepistical orthoepistic orthoepy The study of pronunciation. orthoericssonite An orthorhombic-dipyramidal reddish black mineral containing barium, hydrogen, iron, manganese, oxygen, and silicon. orthoester Any compound, of general formula R-C(OR^')₃, having three alkoxy groups on a single carbon atom orthoevolution orthogenesis orthoevolutionary Of or relating to orthoevolution. orthoexciton An exciton whose spin is parallel to that of its hole orthofacial Describing surgery to the bones of the face augmented by plastic surgery to the overlying tissue orthofelsite Synonym of orthophyre. orthoferrite Any of a class of chemical compounds with the general formula RFeO₃, where R is any rare earth element. orthoferrosilite An iron silicate that crystallizes as an orthorhombic pyroxene orthofluvial Describing the area, next to a river, that is frequently flooded orthoform A former anaesthetic. orthoformate Any orthoester, formally derived from formic acid, of general formula HC(OR)₃ orthogamous Of or pertaining to orthogamy orthogamy fertilization of the ovules of a plant by pollen from the same plant orthogastropod Any snail of the subclass Orthogastropoda. orthogenesis The hypothesis that evolution tends toward a certain goal, at least at some scales. orthogenetic Of or pertaining to orthogenesis or orthogenetics. orthogenetically In terms of, or by means of, orthogenesis. orthogeneticist One who supports the idea of orthogenesis. orthogenetics orthogenesis orthogenic Relating to orthogenesis. orthogenomic Relating to orthogenomics orthogenomics The application of genomics to orthopedics orthogeosyncline A linear geosynclinal belt lying between continental and oceanic cratons, and having internal volcanic belts (eugeosynclinal) and external nonvolcanic belts (miogeosynclinal). Also known as geosynclinal couple; primary geosyncline. orthogeriatric Describing orthopaedic care for geriatric patients orthogeriatrics orthopaedics for geriatric patients orthogeris Orthogeriatrics. orthognathic Straight-jawed. orthognathism The quality of being orthognathous. orthognathous Straight-jawed. orthognathy The condition of being orthognathous orthogneiss A gneiss derived from an igneous rock. orthogon A right-angled triangle. orthogonal Of two objects, at right angles; perpendicular to each other. orthogonality The property of being orthogonal. orthogonalization The process of converting a set of functions or vectors into orthogonal ones. orthogonalize To make orthogonal. orthogonally In an orthogonal manner; perpendicularly; at right angles Orthogonian A member of the Orthogonian society, a social club at Whittier College founded by Richard M. Nixon in opposition to the wealthy elites at Whittier. orthogonium right-angled triangle orthograde Walking or standing with the body upright. orthogradely In an orthograde manner. orthograft an orthotopic graft orthograph An orthographic projection. orthographer Someone who devises an orthography. orthographic Of a projection used in maps, architecture etc., in which the rays are parallel. orthographical Of, or relating to orthography or spelling. orthographically Regarding or relating to orthography (the way in which languages, usually natural languages, are written). orthographist One who is versed in orthography. orthographize To spell correctly or according to usage or pronunciation. orthography A method of representing a language or the sounds of language by written symbols; spelling. orthograptid Any graptolite of the genus Orthograptus. orthogravitropism The normal tendency of a plants parts to bend downward under the effects of gravity orthogrid A structure similar to an isogrid but having rectangular rather than triangular openings. orthogroup The group of genes descended from a single gene in the last common ancestor of a clade of species. orthohantavirus Any member of the genus Orthohantavirus of single-stranded, enveloped, negative-sense RNA viruses. orthohedric Relating to, or characteristic of an orthohedron orthohedron A figure, somewhat like a cube but with two square faces and four rectangular faces orthohepadnaviral Relating to orthohepadnaviruses orthohepadnavirus Any virus of the genus Orthohepadnavirus orthohexagonal Having orthorhombic hexagonal symmetry orthohyperkeratosis Synonym of orthokeratosis. orthohyperkeratotic Relating to orthohyperkeratosis. orthoimage An orthophoto. orthoimagery orthoimages in general; their production orthokeratological Relating to orthokeratology. orthokeratology The creation of gas-permeable contact lenses that temporarily reshape the cornea to reduce refractive errors. orthokeratosis Hyperkeratosis without parakeratosis. orthokeratotic Related to orthokeratosis