Medical Definition of Tri-
1.
1. A prefix meaning three, thrice, threefold; as in tricoloured, tridentate.
2. A prefix (also used adjectively) denoting three proportional or combining part, or the third degree of that to the name of which it is prefixed; as in trisulphide, trioxide, trichloride.
Origin: Gr. Tri- or L. Tri-, sometimes through French; akin to L. Tres three, and E. Three. See Three.
(29 Oct 1998)
Lexicographical Neighbors of Tri-
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