Webster’s Revised Unabridged Dictionary · 1913
Prophragma
Pro·phrag′ma (·frăg′mȧ), n.; pl. Prophragmata (#). [NL., fr. Gr. πρό before + φράγμα, -ατος, fence, screen. ] (Zoöl.) An internal dorsal chitinous process between the first two divisions of the thorax of insects.