lunula


lu·nu·la

noun \ˈlü-nyə-lə\
plural lu·nu·lae \-(ˌ)lē also -ˌlī\

Definition of LUNULA

: a crescent-shaped body part: as a : the whitish mark at the base of a fingernail—called also half-moon b : the crescentic unattached border of a semilunar valve

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