lunule

A small crescent-shaped structure or marking, such as a depression near the hinge of a bivalve shell.

One of the perforations formed by the union of digitate processes of the test of certain thin forms of echinoids, as Rotula Augusti.

Something in the shape of a little moon or crescent.

Anything crescent-shaped; a crescent-shaped part or mark; a lunula; a lune.

A lune. See Lune.

A small or narrow crescent.

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.

Anything crescent-shaped; a crescent-shaped part or mark; a lunula or lune.

A special area in front of the beak of many bivalve shells, sometimes shaped like a double crescent, but more often heart-shaped.