Learner's definition of ANTENNA
a thin sensitive organ on the head of an insect, crab, etc., that is used mainly to feel and touch things
— sometimes used figuratively
◊ The plural of antenna in this sense is usually antennae.
a device (such as a wire or a metal rod) for sending or receiving radio or television signals
see picture at car
◊ The plural of antenna in this sense is usually antennas.