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The Collaborative International Dictionary
Lingula flags

Lingula \Lin"gu*la\ (l[i^][ng]"g[-u]*l[.a]), n.; pl. -l[ae] (l[i^][ng]"g[-u]*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.