Definition of tri- in English:

tri-

combining form

1Three; having three: triathlon
1.1 Chemistry (In names of compounds) containing three atoms or groups of a specified kind: trichloroethane

Origin

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

Definition of tri- in:

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Word of the day abjure
Pronunciation: əbˈdʒʊə
verb
solemnly renounce (a belief, cause, or claim)