noun
or ridg·ling ˈrijliŋ
( -s )
Etymology: perhaps from ridge (I) + -ling; from the supposed remaining of the undescended testes near the animal's back
1. : a male animal having one or both testes undescended ; especially : a horse exhibiting such abnormality and being typically male in conformation and behavior but sterile when the condition is bilateral
2. : an imperfectly castrated male animal — compare half-castrate