tri- Hear it!

tri- definition

tri- (trī)

  1. having, combining, or involving three triangle, trichromatic
  2. triply, in three ways or directions triphibian
  3. three times, into three trisect
  4. every three, every third triennial, triweekly
  5. Chem. having three atoms, groups, or equivalents of (the thing specified) tribasic, tribromide

Etymology: < Fr, L, or Gr: Fr tri- < L (< tres, three) or Gr (< treis, three, tris, thrice)

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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