ləˈsinēə noun
( plural lacini·ae -ēˌē ; or lacinias )
Etymology: New Latin, from Latin, lappet, flap; akin to Latin lacer mangled — more at lacerate
1. : a narrow incised segment in a leaf or similar structure
2.
a. : the inner process of the stipes of an insect's maxilla and especially of its first maxilla
b. : a slender fleshy process on the head of a fish