lacinia

[ luh-sin-ee-uh ]
/ ləˈsɪn i ə /

noun, plural la·cin·i·ae [luh-sin-ee-ee] /ləˈsɪn iˌi/, la·cin·i·as.

Botany. a jagged or irregular part of a leaf or petal.
Zoology. the pointed posterior of the maxilla of an insect.