lingula

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CIDE DICTIONARY

lingula, n. [L., a little tongue.].

A tonguelike process or part. [1913 Webster]
Any one of numerous species of brachiopod shells belonging to the genus Lingula, and related genera. See Brachiopoda, and Illustration in Appendix. [1913 Webster]

Lingula flags (Geol.), a group of strata in the lower Silurian or Cambrian system of Wales, in which some of the layers contain vast numbers of a species of Lingula.