(plural nether regions)
- (often pluralized) Hell; a realm beneath the surface of the earth conceived as the abode of the souls of the dead and, sometimes, as the abode of demons or evil spirits.
- (often pluralized, by extension) A place which is subterranean or enclosed beneath a surface, especially one which is dark, dank, or otherwise inhospitable.
- (often pluralized, euphemistic, sometimes humorous) The groin or buttocks.
From nether- + region.