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tri-
- having, combining, or involving three: triangle, trichromatic
- triply, in three ways or directions: triphibian
- three times, into three: trisect
- every three, every third: triennial, triweekly
- Chem. having three atoms, groups, or equivalents of (the thing specified): tribasic, tribromide
See tri- in American Heritage Dictionary 4
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