{Guinea plum} (Bot.), the fruit of {Parinarium excelsum}, a large West African tree of the order {Chrysobalane[ae]}, having a scarcely edible fruit somewhat resembling a plum, which is also called {gray plum} and {rough-skin plum}. {Guinea worm} (Zo["o]l.), a long and slender African nematoid worm ({Filaria Medinensis}) of a white color. It lives in the cellular tissue of man, beneath the skin, and produces painful sores.