a combining form meaning “three,” used in the formation of compound words: triacid; triatomic.
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A Long List of Affixes: Suffixes, Prefixes, and Combining FormsSuffixes -able, -ible, -ile: (form adjs) able to, fit to, worthy, capable; apt to; subject to being ~-ed -ac: one affect with -ac, -al, -ane, -ar, -ary, -ch, -ese, -ic, -ical, -id, -ile, -ine, -ish, -ory: like, of, pertaining to; characterized by -aceae: families of plants -aceous, -ous: resemblance to a substance; full of -acy, -age, -ance, -ancy, -asm, -dom, -ence, -ency, -hood, -ism, -ity, -ment, -mony, -ness, -ry, -ship, …
Origin of tri-
Middle English < Latin, combining form representing Latin trēs, tria, Greek treîs, tría three
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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
word-forming element meaning "three," from Latin tres (neuter tria) or Greek treis (neuter tria) "three" (see three).
Online Etymology Dictionary, © 2010 Douglas Harper
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.