tri-


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

QUIZZES

DON’T VACILLATE! VANQUISH THIS WORD OF THE DAY QUIZ!

It’d be a real faux pas to miss this quiz on the words from August 3–9, 2020!
Question 1 of 7
What does “vacillate” mean?

Origin of tri-

Middle English <Latin, combining form representing Latin trēs, tria,Greek treîs, tríathree
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for tri-

tri-

prefix

three or thricetriaxial; trigon; trisect
occurring every threetrimonthly

Word Origin for tri-

from Latin trēs, Greek treis
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

Medical definitions for tri-

tri-

pref.

Three:tricuspid.
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.