The Collaborative International Dictionary of English v.0.48:
Chough \Chough\, n. [OE. choughe, kowe (and cf. OE. ca), fr. AS.
ce['o]; cf. also D. kauw, OHG. ch[=a]ha; perh. akin to E.
caw. [root]22. Cf. Caddow.] (Zool.)
A bird of the Crow family (Fregilus graculus) of Europe. It
is of a black color, with a long, slender, curved bill and
red legs; -- also called chauk, chauk-daw, chocard,
Cornish chough, red-legged crow. The name is also applied
to several allied birds, as the Alpine chough.
Cornish chough (Her.), a bird represented black, with red
feet, and beak; -- called also aylet and sea swallow.