Definitions:
any of several small tongue-shaped structures; specifically (a) a protuberance of the sphenoid bone or of the mandible; (b) a subdivision of the vermis of the cerebellum; (c) a part of the left lung projecting downward from the upper lobe.

a small tongue-shaped object or part; (in later use) specifically (historical) a strip of leather covering the instep in ancient greek and roman shoes.

a brachiopod of the genus lingula or class lingulata; the shell of this, typically having a rounded oblong shape. also (in form lingula): the genus itself.