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adjective Chemistry.

pertaining to or occupying two adjacent positions in the benzene ring. Compare meta², para³.

Origin:
1875–80; independent use of ortho-

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Etymonline

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, © 2010 Douglas Harper
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00:10

Most ortho is always a great word to know.

So is interrobang. Does it mean:

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.

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American Heritage

Medical Dictionary

ortho- or orth-
pref.

Straight; upright; vertical: orthotropic.
Correct; correction: orthopsychiatry.
Hydrated form of an acid or of its salts: orthoboric acid.
Diatomic molecules in which the nuclei have the same direction of spin: orthohydrogen.
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.

American Heritage

Abbreviations & Acronyms

ORTHO
American Orthopsychiatric Association

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-Carrie Chapman Catt

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most ortho

or·tho