WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
an outgrowth on a plant or animal such as a fowl's wattle or a protuberance near the hilum of certain seeds
Word Usage
"Lateral to the caruncula is a slight semilunar fold of conjunctiva, the concavity of which is directed toward the cornea; it is called the plica semilunaris."