Tri- Definition
trī
prefix
Three.
Trilobate.
American Heritage
Occurring at intervals of three.
Trimonthly.
American Heritage
Occurring three times during.
Triweekly.
American Heritage
affix
Having, combining, or involving three.
Triangle, trichromatic.
Webster's New World
Triply, in three ways or directions.
Triphibian.
Webster's New World
Three times, into three.
Trisect.
Webster's New World
Every three, every third.
Triennial, triweekly.
Webster's New World
Having three atoms, groups, or equivalents of (the thing specified)
Tribasic, tribromide.
Webster's New World
abbreviation
Toxic Release Inventory.
Wiktionary
Origin of Tri-
-
Middle English from Latin Greek trei- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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