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From: Webster's Revised Unabridged Dictionary (1913)

 Tri-
 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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