Definition of nail:

part of speech: verb

To fasten or unite with nails.

part of speech: noun

One of the flat horny substances at the ends of the fingers and toes; a pointed piece of iron or other metal, commonly with a head, used to fasten wood- work; a measure of length, one- sixteenth of a yard.

Usage examples:

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A method of fastening the ends of pieces of wood together, by slipping the one, cut in the form of a dove's tail, into the correspondent notches of another; a strong way of jointing. ...