English

tetracopper

From tetra- + copper.

Proto-Indo-European *kʷetwóres ‘four’

Proto-Hellenic *kʷétwores ‘four’

Ancient Greek τέσσαρες ‘four’

Ancient Greek τέτταρες ‘Attic form of τέσσαρες’

Ancient Greek Κῠ́προς ‘Cyprus’

Latin aes Cyprium

Late Latin cuprum

Old English coper

Middle English coper ‘copper ore’

Today it means

noun Four atoms of copper in a chemical compound.

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

Etymograph / tetracopper