Definition of nether adjective from the Oxford Advanced Learner's Dictionary

 

nether

 adjective
adjective
BrE BrE//ˈneðə(r)//
 
; NAmE NAmE//ˈneðər//
 
[only before noun](literary or humorous)
 
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lower a person’s nether regions (= their genitals) Word Origin Old English nithera, neothera, of Germanic origin; related to Dutch neder- (found in compounds), neer, and German nieder, from an Indo-European root meaning ‘down’.
See the Oxford Advanced American Dictionary entry: nether