American Heritage® Dictionary of the English Language, Fourth Edition
- n. A lunula.
Century Dictionary and Cyclopedia
- n. Something in the shape of a little moon or crescent. In conchology, the lunula, a crescentic impression on each valve of many bivalve shells, in front of the umbo, forming with its fellow an oval or somewhat cordate figure; it is conspicuous in the Veneridæ and many related forms.
- n. One of the perforations formed by the union of digitate processes of the test of certain thin forms of echinoids, as Rotula Augusti.
- n. Anything crescent-shaped; a crescent-shaped part or mark; a lunula or lune.
- n. A special area in front of the beak of many bivalve shells, sometimes shaped like a double crescent, but more often heart-shaped.
GNU Webster's 1913
- n. (Anat.) Anything crescent-shaped; a crescent-shaped part or mark; a lunula; a lune.
- n. (Chem.) A lune. See Lune.
- n. A small or narrow crescent.
- n. A special area in front of the beak of many bivalve shells. It sometimes has the shape of a double crescent, but is oftener heart-shaped. See
- n. the crescent-shaped area at the base of the human fingernail
- French, from Latin lunula, diminutive of luna ("moon"). (Wiktionary)
“Frontal lunule: Diptera; an oval or crescentic space above the base of antennae in Cyclorrhapha, bounded by the frontal suture.”
“Frontal fissure: Diptera; the impressed line extending from the frontal lunule to the border of the mouth.”
“Frontal suture: Diptera; separates the frontal lunule from that part of the head above it: in Coleopteran; = clypeal suture.”
“Shell solid, surface marked by numerous concentric lines of growth, obliquely cordate; posterior margin produced; anterior short; umbones recurved, lunule cordate; pallial line sinuated; margin crenulated.”
“-- (Fig. 222.) Shell smooth, moderately inflated, thick, beaks prominent, lorsal margin depressed; anterior margin rounded, lunule anceolate.”
“[VENUS CRIBRARI] Shell thick, medium size, slightly ventricose, furnished upon the outside by about twenty-five sharp lamelliform concentric and recurved ribs, crenulated upon the umbonal side; ribbed or ridged transversely on the ventral side, the ridges extending across to the adjacent rib; lunule crenulated.”
“[CRASSATELLA GIBBESH] "Shell somewhat triangular, thick, concentrically furrowed; buccal side rounded; anal side somewhat beaked, angular, with a longitudinal ridge; umbones incurved; lunule somewhat excavated.”
“Shell small, thick, compressed, smooth or concentrically furrowed; lunule impressed; ligament external; hinge teeth 2 -- 2; anterior tooth in the right valve large and thick.”
“In rare cases, different DIMSUFs yield diverse meanings: lune ` moon '> lunettes ` pair of spectacles' but also > lunule ` lunula, 'the white area at the base of the fingernail being crescent-shaped.”
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