Pronunciation: (fos'u),[key] —n., —pl.fos•saePronunciation: (fos'ē).[key]Anat. a pit, cavity, or depression, as in a bone.
Pronunciation: (fos'u),[key] —n. a forest-dwelling genetlike mammal, Cryptoprocta ferox, of the civet family, native to Madagascar, with a short coat of white, black, gray, or brown: now rare. Also called fos'sa cat".