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