Meaning of “nail” - Learner’s Dictionary

nail

noun [ C ] us uk /neɪl/
He drove the nail into the wall with a hammer.Could you hammer a nail into the wall to hang this picture up?The drawer was full of rusty nails.The floorboards are held in place by nails.Fasten the sheets of wood with nails or screws.
METAL OBJECT

B2 a thin piece of metal with a sharp end, used to join pieces of wood together:

a hammer and nails
FINGERS/TOES

B2 the hard surface at the end of your fingers and toes:

to cut / your nails
Stop biting / your nails.

(Definition of “nail noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)