English

trithallium

From tri- + thallium.

Proto-Indo-European *tri- ‘three, threefold’

Proto-Italic *tri- ‘three, tri-’

English tri-

Proto-Indo-European *dʰelh₁- ‘to bloom’

Ancient Greek θαλλός ‘green branch’

Today it means

noun Three thallium atoms or cations in a molecule (Tl₃)

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

Etymograph / trithallium