Where does “hemitriglyph” come from?

hemitriglyph (English) comes from English triglyph, from Ancient Greek τρίγλυφος, from Ancient Greek τρῐ-, from Ancient Greek τρεῖς, from Proto-Hellenic tréyes, from Proto-Indo-European *tréyes.

hemitriglyph (English): A portion of a triglyph, made incomplete by the sudden breaking off of the frieze

Definitions

A portion of a triglyph, made incomplete by the sudden breaking off of the frieze

Ancestry of “hemitriglyph”, step by step

Step	Language	Word	Meaning
1	English	triglyph	A vertically channeled tablet of the Doric frieze
2	Ancient Greek	τρίγλυφος	thrice-cloven; triglyph, a three-grooved tablet...
3	Ancient Greek	τρῐ-	three; {{l\|en\|tri-}}
4	Ancient Greek	τρεῖς	three
5	Proto-Hellenic	tréyes	three
6	Proto-Indo-European	*tréyes	—

Every word from Proto-Indo-European *tréyes →Every word from Ancient Greek τρῐ- →Every word from Proto-Hellenic tréyes →