What is "sicula"

n. (context zoology English) The hard, triangular apex of a graptolite from which it grows.

Șicula is a commune in Arad County, Romania, is situated on the southern part of the Teuz Plateau, along the Crişul Alb River. Its surface stretches over 13,130 ha. It is composed of three villages: Chereluș (Kerülős), Gurba (Garba) and Șicula (situated at from Arad).