Hypertext Webster Gateway: "tri"

From Webster's Revised Unabridged Dictionary (1913) (web1913)

Tri- \Tri-\ [Gr. tri- or L. tri-, sometimes through French; akin
to L. tres three, and E. three. See {Three}.]
1. A prefix meaning three, thrice, threefold; as in
tricolored, tridentate.

2. (Chem.) 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.

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