Definify.com
Webster 1913 Edition
Whethering
Wheth′er-ing
,Noun.
 The retention of the afterbirth in cows. 
Gardner.
 Definition 2025
whethering
whethering
English
Noun
whethering (uncountable)
-  (obsolete) The retention of the afterbirth in cows.
- (Can we find and add a quotation of Gardner to this entry?)
 
References
- OED.