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variant of extra- (used to contrast with intro-, ):
extrovert. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Word Origin and History for extro-

word-forming element meaning "outwards," a variant of extra- by influence of intro-.

Online Etymology Dictionary, © 2010 Douglas Harper
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extro- in Medicine

extro- pref.
Variant of extra-.

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