Lexic.us

2. Prefix. (chemistry) Used in combination with a known element name (e.g. 'tri-silicon') to designate an unknown element that would reside three periods lower than the known element on a Mendeleev-type periodic table. See Mendeleev's predicted elements. ¹

¹ Source: wiktionary.com

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)

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