tri-

  1. Prefix.  three.
  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.

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This entry was last updated on RefTopia from its source on 3/20/2012.