caltrap,
n. [OE.
calketrappe,
calletrappe, caltor (in both senses), fr. AS.
collræppe,
calcetreppe, sort of thistle; cf. F.
chaussetrape star thistle, trap, It.
calcatreppo,
calcatreppolo, star thistle. Perh. from L.
calx heel + the same word as E.
trap. See 1st
Trap.].