English

trilith

From tri- + -lith.

Formed from tri + lith

Proto-Indo-European *tréyes ‘three’

English tri

Proto-Germanic *liþuz ‘limb’

Proto-West Germanic *liþu

Old English liþ ‘limb, member, joint, tip of finger, point’

Middle English lith

English lith

Today it means

noun A trilithon.

Language periods are conventional ranges, not dates for this word.