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Webster 1913 Edition
Lunule
Lu′nule
,Noun.
[F., fr. L.
lunula
, dim. of luna
moon.] 1.
(Anat.)
Anything crescent-shaped; a crescent-shaped part or mark; a lunula; a lune.
3.
(Zool.)
(a)
A small or narrow crescent.
(b)
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 Illust. of
Bivalve
.