1 plural miceHBA
a small furry animal with a pointed nose and a long tail that lives in people's houses or in fields:
The cat laid a dead mouse at my feet.
a field mouse
2TD plural mousesTD
a small object connected to a computer by a wire, which you move with your hand to give instructions to the computer:
Select the printer icon and then click the left mouse button.
3 plural mice informal
a quiet, nervous person