RhymeZone: mousehole definitions

Definitions of mousehole:

noun: A hole through which a mouse enters a room.
noun: Any small hole or opening.
noun: (oil industry, drilling) The storage area on a drilling rig where the next joint of drilling pipe is held until needed.
noun: A village and fishing port in Penzance parish, Cornwall, England (OS grid ref SW4726).

(Definitions from Wiktionary)