The Collaborative International Dictionary
Prophragma
Prophragma \Pro*phrag"ma\, n.; pl. Prophragmata. [NL., fr. Gr. ? before + ?, ?, fence, screen. ] (Zo["o]l.) An internal dorsal chitinous process between the first two divisions of the thorax of insects.
Wiktionary
prophragma
n. (context zoology English) An internal dorsal chitinous process between the first two divisions of the thorax of insects.