lunule
noun
lu·nule ˈlü-(ˌ)nyül 
: a crescent-shaped body part or marking (such as the whitish mark at the base of a fingernail)
Word History
Etymology
New Latin lunula, from Latin, crescent-shaped ornament, from diminutive of luna moon
First Known Use
1828, in the meaning defined above
Medical Definition
lunule
noun
lu·nule ˈlü-(ˌ)nyü(ə)l
: lunula