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[awr-thoh] /ˈɔr θoʊ/

adjective, Chemistry.
pertaining to or occupying two adjacent positions in the benzene ring.
Compare 2 , 3 .
a combining form occurring in loanwords from Greek, where it meant “straight,” “upright,” “right,” “correct” (orthodox) and on this model used in the formation of compound words (orthopedic).

combining form
straight or upright: orthotropous
perpendicular or at right angles: orthoclastic
correct or right: orthodontics, orthodox, orthography, orthoptics
(often in italics) denoting an organic compound containing a benzene ring with substituents attached to adjacent carbon atoms (the 1,2- positions): orthodinitrobenzene, o- Compare oarsman Compare oarsman
denoting an oxyacid regarded as the highest hydrated form of the anhydride or a salt of such an acid: orthophosphoric acid See meta- (sense 6)
denoting a diatomic substance in which the spins of the two atoms are parallel: orthohydrogen See para-1 (sense 8)

before vowels orth-, word-forming element meaning “straight, upright, rectangular, regular; true, correct, proper,” now mostly in scientific and technical compounds, from Greek ortho-, stem of orthos “straight, true, correct, regular,” from PIE *eredh- “high” (cf. Sanskrit urdhvah “high, lofty, steep,” Latin arduus “high, steep,” Old Irish ard “high”).

ortho- or orth-

American Orthopsychiatric Association


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    [awr-oh-bang-key-shuh s, or-] /ˌɔr oʊ bæŋˈkeɪ ʃəs, ˌɒr-/ adjective 1. belonging to the Orobanchaceae, the broomrape family of plants. /ˌɔːrəʊbæŋˈkeɪʃəs/ adjective 1. of, relating to, or belonging to the Orobanchaceae, a family of flowering plants all of which are root parasites, including broomrapes

  • Orthocartan

    mathematics, tool A system for symbolic mathematics, especially General Relativity, written by A. Krasinski of Warsaw in the early 1980s. (1995-04-12)

  • Orthocenter

    [awr-thuh-sen-ter] /ˈɔr θəˌsɛn tər/ noun, Geometry. 1. the point of intersection of the three altitudes of a triangle.

  • Orthocentre

    /ˈɔːθəʊˌsɛntə/ noun 1. the point of intersection of any two altitudes of a triangle

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