The Collaborative International Dictionary
Prosomata
Prosoma \Pro*so"ma\, n.; pl. Prosomata. [NL., fr. Gr. ? before + ?, ?, body.] (Zo["o]l.) The anterior of the body of an animal, as of a cephalopod; the thorax of an arthropod.
Wiktionary
prosomata
n. (plural of prosoma English)