croze

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A groove inside the end of a barrel or cask into which the head is set.

Century Dictionary and Cyclopedia

1. n. The cross-groove in the staves of a cask or barrel in which the edge of the head is inserted.
2. n. A coopers' tool for cutting a cross-groove in staves for the head of a cask. It resembles a circular plane.
3. To make a croze or groove in, as a barrel.
4. In hat-making, to refold (a hat-body) so that different surfaces may in turn be presented to the action of the felting-machine.

Wiktionary

1. n. A groove at the ends of the staves of a barrel into which the edge of the head is fitted
2. n. A cooper's tool for making these grooves.

GNU Webster's 1913

1. n. A cooper's tool for making the grooves for the heads of casks, etc.; also, the groove itself.