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extro-

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  1. variant of extra- (used to contrast with intro-): extrovert.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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

extro- in Medicine

extro-

pref.
  1. Variant ofextra-