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单词 ortho
释义

WordReference Random House Unabridged Dictionary of American English © 2024
or•tho  (ôrthō),USA pronunciation adj. [Chem.]
  1. Chemistrypertaining to or occupying two adjacent positions in the benzene ring. Cf. meta 2, para 3.
  • independent use of ortho- 1875–80

ortho-, 
    1. 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).
    2. 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 © 2024
ortho-, prefix. 
  1. 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
  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)
    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
  6. denoting a diatomic substance in which the spins of the two atoms are parallel: orthohydrogen
Etymology: from Greek orthos straight, right, upright
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