Patella /(?)/

pl. Patellæ

1. A small dish, pan, or vase.
2. The kneecap; the kneepan; the cap of the knee. (Anat.)
3. A genus of marine gastropods, including many species of limpets. The shell has the form of a flattened cone. The common European limpet (Patella vulgata) is largely used for food. (Zool.)
4. A kind of apothecium in lichens, which is orbicular, flat, and sessile, and has a special rim not a part of the thallus. (Bot.)