<B>orthognathism, </B>noun.<DL COMPACT><DD> the character of being orthognathous. </DL>
<A NAME="orthognathous">
<B>orthognathous, </B>adjective.<DL COMPACT><DD> (Anthropology.) straight-jawed; not having the jaws projecting beyond the vertical line drawn from the forehead. </DL>
<A NAME="orthognathy">
<B>orthognathy, </B>noun. =orthognathism.</DL>
<A NAME="orthogneiss">
<B>orthogneiss, </B>noun.<DL COMPACT><DD> (Geology.) a gneiss formed from igneous rock. </DL>
<A NAME="orthogon">
<B>orthogon, </B>noun.<DL COMPACT><DD> a rectangular figure. </DL>
<A NAME="orthogonal">
<B>orthogonal, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> <B>1. </B>(Mathematics.) <DD><B> a. </B>having to do with or involving right angles; rectangular. (SYN) right-angled. <DD><B> b. </B>(of certain functions) having an integral that is equal to zero or to one. <DD><B> c. </B>(of vectors) having a dot product equal to zero. <DD><B> d. </B>consisting of orthogonal elements. <DD><B> 2. </B>(Crystallography.) orthorhombic. <DD><I>noun </I> an orthogonal line or plane. <BR> <I>Ex. ... reading in both directions along all orthogonals and main diagonals (Scientific American).</I> adv. <B>orthogonally.</B> </DL>
<A NAME="orthogonality">
<B>orthogonality, </B>noun.<DL COMPACT><DD> orthogonal quality or state. </DL>
<A NAME="orthogonalize">
<B>orthogonalize, </B>transitive verb, <B>-ized,</B> <B>-izing.</B><DL COMPACT><DD> to make orthogonal. </DL>
<A NAME="orthographer">
<B>orthographer, </B>noun.<DL COMPACT><DD><B> 1. </B>a person skilled in orthography. <DD><B> 2. </B>a person who spells correctly. </DL>
<A NAME="orthographic">
<B>orthographic, </B>adjective.<DL COMPACT><DD><B> 1. </B>having to do with orthography. <BR> <I>Ex. an orthographic mistake.</I> <DD><B> 2. </B>correct in spelling. <BR> <I>Ex. For the sake of simplicity only the orthographic spellings are here given (Simeon Potter).</I> <DD><B> 3. </B>(Geometry.) orthogonal. </DL>
<A NAME="orthographically">
<B>orthographically, </B>adverb.<DL COMPACT><DD> in an orthographic manner; according to the rules of proper spelling. </DL>
<A NAME="orthographicprojection">
<B>orthographic projection,</B><DL COMPACT><DD> a projection on a plane by lines perpendicular to the plane. </DL>
<A NAME="orthography">
<B>orthography, </B>noun, pl. <B>-phies.</B><DL COMPACT><DD><B> 1a. </B>correct spelling considered as right or wrong according to accepted usage. <DD><B> b. </B>any system of spelling. <BR> <I>Ex. The function of orthography is to identify the phonemes, or distinctive vowels and consonants, of a language (Harold B. Allen).</I> <DD><B> 2. </B>the art of spelling; study of spelling. <DD><B> 3. </B>a drawing in which the object is projected on a plane by lines perpendicular to the plane. </DL>
<A NAME="orthohydrogen">
<B>ortho-hydrogen, </B>noun.<DL COMPACT><DD> a form of hydrogen consisting of molecules whose pairs of nuclei have spins in the same direction. <BR> <I>Ex. Three quarters of hydrogen gas is ortho-hydrogen (Monroe M. Offner).</I> </DL>
<A NAME="orthokeratology">
<B>orthokeratology, </B>noun.<DL COMPACT><DD> a method of correcting or improving the eyesight by altering the cornea through the periodical application of new contact lenses. </DL>
<A NAME="orthomolecular">
<B>orthomolecular, </B>adjective.<DL COMPACT><DD> of or based upon a theory according to which disease may be caused by deficient molecular concentrations of essential substances in the body, so that cures may be effected by combining medical treatment with dietary and vitamin therapy to overcome the molecular deficiency. </DL>
<A NAME="orthonormal">
<B>orthonormal, </B>adjective.<DL COMPACT><DD> (Mathematics.) having to do with or consisting of normal orthogonal elements. </DL>
<B>orthopedic, </B>adjective.<DL COMPACT><DD> of or having to do with orthopedics. <BR> <I>Ex. an orthopedic surgeon.</I> adv. <B>orthopedically.</B> </DL>
<A NAME="orthopedics">
<B>orthopedics, </B>noun.<DL COMPACT><DD> the branch of surgery that deals with the deformities and diseases of bones and joints, especially in children. </DL>
<A NAME="orthopedist">
<B>orthopedist, </B>noun.<DL COMPACT><DD> a surgeon who specializes in orthopedics. <BR> <I>Ex. The big Cornell athletic clinic, headed by a crack team of orthopedists and physiotherapists, is equipped to handle everything from mild Charley horses to severe skull fractures (Newsweek).</I> </DL>
<A NAME="orthopedy">
<B>orthopedy, </B>noun. =orthopedics.</DL>
<A NAME="orthophosphate">
<B>orthophosphate, </B>noun.<DL COMPACT><DD> a salt or ester of phosphoric acid. </DL>
<A NAME="orthophosphoricacid">
orthophosphoric acid, =phosphoric acid.</DL>
<A NAME="orthophoto">
<B>orthophoto, </B>noun.<DL COMPACT><DD> a composite photograph of terrain, made by joining narrow strips of other photographs so that the finished picture is fully corrected in scale, position, etc.. <BR> <I>Ex. Whereas an aerial photograph of rolling or mountainous terrain will have inherent scale and angular distortions, the orthophoto is true to scale; shapes, angles, and distances are correct (George G. Alexandridis).</I> </DL>
<A NAME="orthopnea">
<B>orthopnea, </B>noun.<DL COMPACT><DD> a condition, associated with asthma and certain heart ailments, in which satisfactory breathing can take place only when one is in an erect position. </DL>
<A NAME="orthopraxy">
<B>orthopraxy, </B>noun.<DL COMPACT><DD><B> 1. </B>correctness of practice, action, or procedure. <DD><B> 2. </B>corrective treatment of deformities; orthopedics. </DL>
<A NAME="orthopsychiatric">
<B>orthopsychiatric, </B>adjective.<DL COMPACT><DD> of or having to do with orthopsychiatry. adv. <B>orthopsychiatrically.</B> </DL>
<A NAME="orthopsychiatrist">
<B>orthopsychiatrist, </B>noun.<DL COMPACT><DD> a person who practices orthopsychiatry. </DL>
<A NAME="orthopsychiatry">
<B>orthopsychiatry, </B>noun.<DL COMPACT><DD> the branch of psychiatry dealing with the prevention or early correction of mental disorders, as personality and behavior problems, especially in young people. </DL>
<B>orthopteron, </B>noun, pl. <B>-tera.</B><DL COMPACT><DD> an orthopterous insect; orthopter. </DL>
<A NAME="orthopterous">
<B>orthopterous, </B>adjective.<DL COMPACT><DD> of or belonging to an order of insects characterized by longitudinally folded, membranous hind wings covered by hard, narrow forewings, and having mouthparts adapted for chewing. Orthopterous insects have an incomplete metamorphosis. The order includes crickets, grasshoppers, locusts, and cockroaches. </DL>
<A NAME="orthoptic">
<B>orthoptic, </B>adjective.<DL COMPACT><DD> of, having to do with, or producing normal binocular vision. </DL>
<A NAME="orthopticexercises">
<B>orthoptic exercises,</B><DL COMPACT><DD> a method of exercising the muscles of the eye, especially to correct cross-eye or muscular weaknesses. </DL>
<A NAME="orthoptics">
<B>orthoptics, </B>noun.<DL COMPACT><DD> the treatment of certain visual defects by exercising and training the eye muscles. </DL>
<A NAME="orthorhombic">
<B>orthorhombic, </B>adjective.<DL COMPACT><DD> of or having to do with a system of crystallization in which the three unequal axes intersect at right angles; rhombic. <BR> <I>Ex. an orthorhombic crystal.</I> </DL>
<A NAME="orthoscopic">
<B>orthoscopic, </B>adjective.<DL COMPACT><DD> having to do with or producing correct or normal vision. <BR> <I>Ex. orthoscopic glasses, an orthoscopic eyepiece on a telescope.</I> </DL>
<A NAME="orthostatic">
<B>orthostatic, </B>adjective.<DL COMPACT><DD> (Medicine.) caused by standing up, especially for long periods of time; affecting the body in a vertical position. <BR> <I>Ex. orthostatic hypotension.</I> </DL>
<A NAME="orthotic">
<B>orthotic, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> of or having to do with orthotics. <BR> <I>Ex. Nickel and his colleagues devised an electrically operated orthotic system to provide patients having severe paralysis of the upper limbs with mobility and voluntary hand movements (Richard G. Burwell).</I> <DD><I>noun </I> a device providing artificial support for an impaired joint or muscle of the leg or foot. </DL>
<A NAME="orthotics">
<B>orthotics, </B>noun.<DL COMPACT><DD> the rehabilitation of injured or impaired joints or muscles through artificial support. </DL>
<A NAME="orthotone">
<B>orthotone, </B>adjective, noun.<DL COMPACT><DD><I>adj. </I> <B>1. </B>having an accent, as a word. <DD><B> 2. </B>acquiring an accent, as from position, though not ordinarily accented. <DD><I>noun </I> an orthotone word. The English articles, usually proclitics, are orthotones when emphasized. (Example:) "I did not say <I>a</I> man, I said <I>the</I> man." </DL>
<A NAME="orthotropic">
<B>orthotropic, </B>adjective.<DL COMPACT><DD><B> 1. </B>(Botany.) of, having to do with, or exhibiting orthotropism; growing vertically upward or downward, as a stem or root. <DD><B> 2. </B>having to do with or using a type of bridge design in which steel plates, strengthened by longitudinal ribs, serve both as roadway and structural support. <BR> <I>Ex. an orthotropic bridge or girder. The orthotropic deck, a European innovation, was used for the first time in the United States in two bridges completed in 1967 (William H. Quirk).</I> adv. <B>orthotropically.</B> </DL>
<A NAME="orthotropism">
<B>orthotropism, </B>noun.<DL COMPACT><DD> (Botany,) a tendency to grow in a vertical direction, upward or downward. </DL>
<A NAME="orthotropous">
<B>orthotropous, </B>adjective.<DL COMPACT><DD> (Botany.) (of an ovule) having the nucellus straight, or not inverted, so that the chalaza is at the evident base and the micropyle at the opposite end. </DL>
<B>orthoxylene, </B>noun.<DL COMPACT><DD> one of three isomeric forms of xylene. </DL>
<A NAME="ortolan">
<B>ortolan, </B>noun.<DL COMPACT><DD><B> 1. </B>a small bunting of Europe, northern Africa, and western Asia, the meat of which is regarded as a delicacy. <BR> <I>Ex. Let me die eating ortolans to the sound of soft music (Benjamin Disraeli).</I> <DD><B> 2. </B>any one of various small wild birds of North America, such as the bobolink and the sora. </DL>
