fingernail
Refers specifically to a fingernail, often with a nuance of being natural or unadorned. The prefix 生 (なま) can imply 'raw' or 'natural', distinguishing it from artificial nails.
My fingernails have grown, so I need to cut them.
I have a habit of biting my fingernails.
Compound of 生 (なま, 'raw, natural') + 爪 (つめ, 'nail'). The exact historical derivation is uncertain, but the combination straightforwardly means 'natural nail'.