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The Collaborative International Dictionary
Stragulum

Stragulum \Strag"u*lum\, n.; pl. Stragula. [L., a spread or covering, from sternere to spread out.] (Zo["o]l.) The mantle, or pallium, of a bird.

Wiktionary
stragulum

n. (context zoology English) The mantle, or pallium, of a bird.