• Webster's Revised Unabridged Dictionary
    • Lingula (Anat) A tonguelike process or part.
    • Lingula (Zoöl) Any one of numerous species of brachiopod shells belonging to the genus Lingula, and related genera. See Brachiopoda, and Illustration in Appendix.
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Century Dictionary and Cyclopedia
    • n lingula A little tongue or tongue-like part or process; a ligula. Specifically— In embryology, a cartilaginous strap or bridge on each side of the end of the notochord, connecting the trabeculæ cranii with the parachordal cartilage or basilar plate of the skull of the early embryo.
    • n lingula In zoology: [capitalized] The typical genus of Lingulidæ. The species are numerous; they are mostly fossil, and go back to the Cambrian group, but several are still living. They are found in the sand of the seashores of most parts of the world, living buried in the sand about low-water mark. One is common on the coast of North Carolina. Its shell is bivalve, about an inch long, fiattened, each valve shaped like the bottom of a smoothing-iron, and the two valves working loosely upon each other sidewise, not opening and shutting like those of bivalve mollusks. From the pointed end protrudes a stalk or peduncle from an inch to several inches long, of stiff gristly consistency, and this organ may be incased in a tube formed of sand, like the case of a tube-worm. The broad end of the shell is fringed with little processes. The shell is thin and of a horny texture. The appearance of a lingula is thus somewhat like that of a stalked barnacle or acorn-shell (Lepas), though the animal has no special affinity with a cirriped. The living American lingulas are now placed in a restricted genus Glottidia, the one above described, best known as L. pyramidata, being now called G. audebarti. See cut under Lingulidæ.
    • n lingula Pl. lingulas (-läz). Any species of the genus Lingula or family Lingulidæ; a lingulid or tongue-shell.
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Chambers's Twentieth Century Dictionary
    • n Lingula a tongue-like part or process
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Webster's Revised Unabridged Dictionary
L., a little tongue
Chambers's Twentieth Century Dictionary
L. lingua (old form dingua), the tongue.


In literature:

Lingula has not risen since the Silurian epoch, whereas other molluscs may have risen.
"The Life and Letters of Charles Darwin, Volume II (of II)" by Charles Darwin
Remember Silurian Nautilus, Lingula and other Brachiopods, and Nucula, and amongst Echinoderms, the Silurian Asterias, etc.
"More Letters of Charles Darwin" by Charles Darwin
But the evidence that animal life commenced with the Lingula-flags, 'e.g.
"Lectures and Essays" by T.H. Huxley
The specimens of existing Lingula are precisely similar to those found in the earliest geological formations.
"Scientific American, Volume 40, No. 13, March 29, 1879" by Various
The Buglossus solea or soale plana and oculata as also the Lingula or small soale all in very great plentie.
"The Works of Sir Thomas Browne" by Thomas Browne