\Lin"gu*la\ (l[i^][ng]"g[-u]*l[.a]), n.; pl. {-l[ae]}
(-l[=e]). [L., a little tongue.]
1. (Anat.) A tonguelike process or part.
2. (Zo["o]l.) Any one of numerous species of brachiopod
   shells belonging to the genus {Lingula}, and related
   genera. See {Brachiopoda}, and Illustration in Appendix.
{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.