The lidlike portion of a moss sporangium or of a fruit that detaches to allow the dispersal of spores or seeds.
A covering flap in animals, such as a gill cover.
A gum flap covering (part of) a partially erupted tooth, usually a wisdom tooth.
One of several flaps of cerebral cortex covering the insula.
A structure which serves as a cover or lid.
A pouch-like form on a plant which encloses the seeds.