1.  receptor(n = noun.body) - a cellular structure that is postulated to exist in order to mediate between a chemical agent that acts on nervous tissue and the physiological response;
is a kind of anatomical structure, bodily structure, body structure, complex body part, structure
has particulars: alpha-adrenergic receptor, alpha-adrenoceptor, alpha receptor, beta-adrenergic receptor, beta-adrenoceptor, beta receptor

2.  receptor(n = noun.body) sense organ, sensory receptor - an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation;
is a kind of organ
is a part of sensory system
has parts: papilla
has particulars: lateral line, lateral line organ, enteroceptor, interoceptor, exteroceptor, pineal eye, third eye, baroreceptor, chemoreceptor, thermoreceptor, eye, oculus, optic, ear, organ of hearing, inner ear, internal ear, labyrinth, semicircular canal, stretch receptor
Antonym: effector
Derived form verb receive₃

receptor, n. (often attrib.) Biol.
1 an organ able to respond to an external stimulus such as light, heat, or a drug, and transmit a signal to a sensory nerve.
2 a region of a cell, tissue, etc., that responds to a molecule or other substance.

Etymology:
OF receptour or L receptor (as RECEPTIVE)

alpha receptor, alpha-adrenergic receptor, beta receptor, beta-adrenergic receptor, sensory receptor, stretch receptor