from the GNU version of the Collaborative International Dictionary of English
- n. A hole made by a mouse, for passage or abode, as in a wall; hence, a very small hole like that gnawed by a mouse.
from The Century Dictionary and Cyclopedia
- n. A hole where mice enter or pass, or so small that nothing larger than a mouse may pass in or out; a very small inlet or outlet.
Sorry, no etymologies found.