tri-

tri-

a combining form meaning “three,” used in the formation of compound words: triacid; triatomic.

Origin:
Middle English < Latin, combining form representing Latin trēs, tria, Greek treîs, tría three

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Collins
World English Dictionary
tri-
 
prefix
1.  three or thrice: triaxial; trigon; trisect
2.  occurring every three: trimonthly
 
[from Latin trēs, Greek treis]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

tri-
comb. form meaning "three," from L. tres (neut. tria) or Gk. treis (neut. tria) "three" (see three).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

tri- pref.

  1. Three: tricuspid.

  2. Containing three atoms, molecules, or groups: triacetic acid.

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