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extra-

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  1. a prefix meaning “outside,” “beyond,” freely used as an English formative: extrajudicial; extraterritorial; extra-atmospheric.
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Also extro-.

Origin of extra-

< Latin, combining form of extrā (adv. and preposition) outside (of), without
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for extra-

extra-

prefix
  1. outside or beyond an area or scopeextrasensory; extraterritorial
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Word Origin

from Latin extrā outside, beyond, changed from extera, from exterus outward
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for extra-

only recorded in classical Latin in extraordinarius, but much used in Medieval Latin and modern formations; it represents Latin extra (adv.) "on the outside, without, except," the old fem. ablative singular of exterus "outward, outside," comparative of ex "out of" (see ex-).

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Online Etymology Dictionary, © 2010 Douglas Harper

extra- in Medicine

extra-

pref.
  1. Outside; beyond:extracellular.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.