A strong metal plug screwed into the breech of a musket or other firearm, to close the bottom of the bore.

(obsolete) A large pin used to attach a woman's headdress to a cork mould.

Alternative form of pincushion

Alternative form of pincushion

(chess) A pin in which moving away the pinned piece would allow capture of a piece other than the king.

(chess) A pin where a rook or queen is pinned along a file, or a bishop or queen is pinned along a diagonal.

(chess) A pin in which moving away the pinned piece would illegally expose the king to check.

The tree Quercus palustris. / The tree Quercus ellipsoidalis.

A variety of the game of billiards in which small wooden pins are set up to be knocked down by the balls.

A drill with a central pin or projection to enter a hole, for enlarging the hole, or for sinking a recess for the head of a bolt, etc.; a counterbore.