| PO | the branch of medicine concerned with the feet |
|---|---|
| PO | type genus of the Podicipedidae: grebes |
| PO | large Old World grebe with black ear tufts |
| PO | large stocky grebe of circumpolar regions having a dark neck |
| PO | small grebe with yellow ear tufts and a black neck |
| PO | small European grebe |
| PO | coextensive with the order Podicipitiformes |
| PO | grebes |
| PO | aquatic birds related to the loons |
| PO | grebes |
| PO | a genus of Podicipedidae |
| PO | American grebe having a black-banded whitish bill |