noun Date: 1821 a cage for a small animal (as a squirrel) that contains a rotatable cylinder for exercising, something resembling the working of a ~ in repetitiveness or endlessness
SQUIRREL CAGE
Meaning of SQUIRREL CAGE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012