həˈbenyələ noun
( plural habenu·lae -yə(ˌ)lē)
Etymology: Latin, diminutive of habena strap, thong
1. also ha·ben·u·lar trigone -lə(r)- : an anatomic structure in the form of a band ; especially : a small triangular area of the surface of the epithalamus on either side of the base of the pineal body
2. also habenular nucleus : a nucleus underlying each habenula and connected by commissural fibers that forms a correlation center for olfactory stimuli — called also nucleus habenulae