1.  joystick(n = noun.artifact) control stick, stick - a lever used by a pilot to control the ailerons and elevators of an airplane;
is a kind of lever

2.  joystick(n = noun.artifact) - a manual control consisting of a vertical handle that can move freely in two directions; used as an input device to computers or to devices controlled by computers;
is a kind of control, controller, data input device, input device

joystick, n.
1 colloq. the control column of an aircraft.
2 a lever that can be moved in several directions to control the movement of an image on a VDU screen.