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ortho-

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ortho-

 
Use ortho- in a Sentence
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
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ortho- or orth-  
pref.  

  1. Straight; upright; vertical: orthotropous.

  2. Perpendicular: orthorhombic.

  3. Correct; correction: orthopsychiatry.

  4. The most fully hydrated form of an acid or of its salts: orthoboric acid.

  5. Diatomic molecules in which the nuclei have the same spin direction: orthohydrogen.

  6. Of or relating to one of three possible isomers of a benzene ring with two attached chemical groups in which the carbon atoms with attached groups are adjacent: ortho-dibromobenzene.


[Middle English, from Old French, from Latin, from Greek, from orthos, straight, correct, right.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

ortho- 
a comb. element in forming scientific and technical words, from Gk. ortho-, stem of orthos "straight, true, correct, regular," from PIE *eredh- "high" (cf. Skt. urdhvah "high, lofty, steep," L. arduus "high, steep," O.Ir. ard "high").
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

ortho- or orth-
pref.

  1. Straight; upright; vertical: orthotropic.

  2. Correct; correction: orthopsychiatry.

  3. Hydrated form of an acid or of its salts: orthoboric acid.

  4. Diatomic molecules in which the nuclei have the same direction of spin: orthohydrogen.

  5. ortho-
    Abbr. o- Of or relating to one of three possible isomers of a benzene ring with adjacent carbon atoms having attached chemical groups. Usually used in italic: ortho-dibromobenzene.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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