| tri- | 1. <prefix> A prefix meaning three, thrice, threefold; as in tricoloured, tridentate. 2. <chemistry> 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) |
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| tri-alanyl peptidase | <enzyme> Biliary tract enzyme Registry number: EC 3.4.- (26 Jun 1999) |
| tri-amelia | Absence of three limbs. Origin: tri-+ G. A-priv. + melos, limb (05 Mar 2000) |