Definition of tri- in English:

tri-

combining form

  • 1Three; having three.

    ‘triathlon’
    1. 1.1Chemistry (in names of compounds) containing three atoms or groups of a specified kind.
      ‘trichloroethane’

Usage

See ter-

Origin

From Latin and Greek, from Latin tres, Greek treis three.

Pronunciation:

tri-

/trī/