( a. )
Specif., the natural, unreasoning, impulse by which an animal is guided to the performance of any action, without of improvement in the method.
( a. )
Specif., the natural, unreasoning, impulse by which an animal is guided to the performance of any action, without of improvement in the method.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012