Definitions
1.NounA covering flap in animals, such as a gill cover.
2.NounThe lidlike portion of a moss sporangium or of a fruit that detaches to allow the dispersal of spores or seeds.
3.NounA gum flap covering (part of) a partially erupted tooth, usually a wisdom tooth.
4.NounA structure which serves as a cover or lid.
5.NounOne of several flaps of cerebral cortex covering the insula. (clarification of this definition is needed)