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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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Difficulty index for orth-

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Word Value for orth

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