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medio-

word-forming element from comb. form of Latin medius "middle" (see medial (adj.)).

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Online Etymology Dictionary, © 2010 Douglas Harper

medio- in Medicine

medio-

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