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39 results for: Ortho-

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Dictionary.com Unabridged (v 1.1)Cite This Source
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.a combining form used in the name of that acid in a given series of acids that contains the most water (orthoboric acid). Compare meta-, pyro-.
b.a 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, especially before a vowel, orth-.

[Origin: < Gk, comb. form of orthós straight, upright, correct]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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