The top of the head region of a bird.
[Latin] The top of the head region of a bird.
pil'[=e]-um, n. (ornith.) the top of the head from the base of the bill to the nape--including the forehead or front, the vertex or corona, and the hindhead or occiput:--pl. PIL'[=E]A.
[Latin] One of the hemispheres of the cerebellum.