from
The Collaborative International Dictionary of English v.0.48
lingula \lin"gu*la\ (l[i^][ng]"g[-u]*l[.a]), n.; pl.
{lin"gu*l[ae]} (l[i^][ng]"g[-u]*l[=e]). [L., a little
tongue.]
1. (Anat.) A tonguelike process or part.
[1913 Webster]
2. (Zool.) 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.
[1913 Webster]