TRI-


Meaning of TRI- in English

[ trʌɪ ]

■ combining form three; having three: triathlon.

↘ Chemistry (in names of compounds) containing three atoms or groups of a specified kind: trichloroethane.

Origin

from L. and Gk, from L. tres , Gk treis 'three'.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.