释义 |
WordReference Random House Unabridged Dictionary of American English © 2024or•tho (ôr′thō),USA pronunciation adj. [Chem.]- Chemistrypertaining to or occupying two adjacent positions in the benzene ring. Cf. meta 2, para 3.
- independent use of ortho- 1875–80
ortho-, - 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).
- Chemistry
- a combining form used in the name of that acid in a given series of acids that contains the most water (orthoboric acid). Cf. meta-, pyro-.
- Chemistrya combining form used in the names of the salts of these acids: if the acid ends in -ic, the corresponding salt ends in -ate (orthoboric acid (H3BO3) and potassium orthoborate (K3BO3))* if the acid ends in -ous, the corresponding salt ends in -ite (orthoantimonous acid (H3SbO3) and potassium orthoantimonite (K3SbO3)).
Also,[esp. before a vowel,] orth-. - Greek, combining form of orthós straight, upright, correct
WordReference Random House Learner's Dictionary of American English © 2024ortho-, prefix. - ortho- comes from Greek, where it has the meaning "straight, upright, right, correct '':ortho- + graph → orthography (= correct writing);ortho- + dontics → orthodontics (= dentistry dealing with straightening teeth);ortho- + pedic → orthopedic (= correction of improper bone structure from childhood).
Collins Concise English Dictionary © HarperCollins Publishers:: ortho-, (before a vowel)orth- 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)
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
- denoting a diatomic substance in which the spins of the two atoms are parallel: orthohydrogen
Etymology: from Greek orthos straight, right, upright |