pileum

noun, plural pi·le·a [pahy-lee-uh, pil-ee-uh] /ˈpaɪ li ə, ˈpɪl i ə/.

1. the top of the head of a bird, from the base of the bill to the nape.

noun plural -lea (-lɪə)

1. the top of a bird’s head from the base of the bill to the occiput