cortina \cor*ti"na\ (k[^o]r*t[imac]"n[.a] or
k[^o]r*t[=e]"n[.a]), n.; pl. {cortinae} (k[^o]r*t[=e]"n[=e]).
(Biology)
a cobwebby remnant of the partial veil which in some mature
mushrooms hang from the edges of the cap.
[WordNet 1.5 +PJC]