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Definition of tri- : 1. 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.
2. A prefix meaning three, thrice, threefold; as in tricolored, tridentate.

Synonyms:

after-, ante-, a-, astro-, Anglo-, Afro-, aero-, arch-, all-, anti-