Triangle
Tripod
Triad
Trilogy
Triceratops
Triathlon
Triathlete
Trillion
Tricycle
Triassic
Trigram
Trisect
Triacid
Triatomic
Triannual
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triangle, trim,
tricycle trinomial tridium triangle tri triangular trial triple
Some words that begin with tri [as a prefix] include: 1.trillion 2.triathlon 3.triceratops 4.trilogy 5.triangle 6.tripod 7.triad
Tri Pod Cycle
Yes, thus the prefix "Tri"