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lunula
White crescent at the base of the finger & toenail emerging from beneath the cuticle.
Related
cuticle
Specific
lunula of semilunar valve (lunula of semilunar cusps of aortic/pulmonary valves)
References
Color Atlas & Synopsis of Clinical Dermatology, Common
& Serious Diseases, 3rd ed, Fitzpatrick et al, McGraw Hill, NY,
1997, pg 496