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orth-

1.
variant of ortho- before a vowel:
orthicon.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for orth-

ortho-

combining form
1.
straight or upright: orthotropous
2.
perpendicular or at right angles: orthoclastic
3.
correct or right: orthodontics, orthodox, orthography, orthoptics
4.
(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
5.
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)
6.
denoting a diatomic substance in which the spins of the two atoms are parallel: orthohydrogen See para-1 (sense 8)
Word Origin
from Greek orthos straight, right, upright
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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