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tri-

  1. having, combining, or involving three: triangle, trichromatic
  2. triply, in three ways or directions: triphibian
  3. three times, into three: trisect
  4. every three, every third: triennial, triweekly
  5. Chem. having three atoms, groups, or equivalents of (the thing specified): tribasic, tribromide

See tri- in American Heritage Dictionary 4

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