1 a a title at the head of a page or section of a book etc. b a division or section of a subject of discourse etc.
2 a a horizontal passage made in preparation for building a tunnel. b Mining = DRIFT n. 6.
3 material for making cask-heads.
4 the extension of the top of a curtain above the tape that carries the hooks or the pocket for a wire.
Useful english dictionary. 2012.