fingernail/'fɪŋgəneɪl $ -gər-/

n. the hard flat part that covers the top end of a finger

n. [C] 手指甲：She has long fingernails. 她的手指甲很长。

◇The child has a bad habit of biting his fingernails. 这个孩子有咬手指甲的不良习惯。

构词finger + nail（钉子；指甲）