brad

Short definition from Wiktionary

Noun

1. 1
   A thin, small nail, with a slight projection at the top on one side instead of a head, or occasionally with a small domed head, similar to that of an escutcheon pin.
2. 2
   A paper fastener, a fastening device formed of thin, soft metal, such as shim brass, with a round head and a flat, split shank, which is spread after insertion in a hole in a stack of pages, in much the same way as a cotter pin or a split rivet.
3. 3
   A binary radian.

Verb

1. 1
   To attach using a brad.
2. 2
   To upset the end of a rod inserted in a hole so as to prevent it from being pulled out, as when riveting.

Proper noun

1. 1
   A diminutive of the male given names Bradley, Bradly, or Bradford, also used as a formal given name.
2. 2
   A city in Hunedoara County, Romania.