Sentence examples for lunule from inspiring English sources

At its base the nail plate may have a whitish, arched marking called a lunule.

Always present on thumbnails, lunules may be present or absent on the other fingers and are nearly always absent on the little finger.

Species with lunules are generally called keyhole urchins.

Some species found stranded on the shores of North America have five or six slots, or lunules, through the test (external skeleton).

In many species the hollow, slightly elongated test (internal skeleton), which accommodates the water-vascular system, is symmetrically notched on the edge or has narrow perforations (lunules).