Where does “thoracomere” come from?

thoracomere (English) comes from English -mere, from Ancient Greek μέρος, from Proto-Hellenic *(h)méros.

thoracomere (English): A somite of the thorax of a crustacean

Definitions

Step	Language	Word	Meaning
1	English	-mere	Forming nouns with the sense of part, segment
2	Ancient Greek	μέρος	part, component, region; share, portion; one's...
3	Proto-Hellenic	*(h)méros	—