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The Collaborative International Dictionary
Prophragmata

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
prophragmata

n. (plural of prophragma English)