noun

1. a receiver (in various senses)
2. Biochem. any of a group of substances, mainly proteins, found esp. on the surface of a cell, that combine with specific molecules, hormones, antibodies, drugs, viruses, etc.
3. Physiol. a nerve ending or group of nerve endings specialized for the reception of stimuli; sense organ

Etymology: ME receptour < OFr < L receptor < receptus: see receipt