noun Physiology.
a receptor responding to stimuli originating outside the body.

1905–10; extero- (see exteroceptive) + (re)ceptor

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World English Dictionary
exteroceptor (ˈɛkstərəʊˌsɛptə)
interoceptor Compare proprioceptor any sensory organ or part of the body, such as the eye, able to receive stimuli from outside the body
[C20 extero-, from Latin exterusexterior + (re)ceptor]

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American Heritage
Medical Dictionary

exteroceptor ex·ter·o·cep·tor (ěk'stə-rō-sěp'tər)
One of the peripheral end organs of the afferent nerves in the skin or mucous membranes that respond to stimuli from outside the body.

ex'ter·o·cep'tive adj.
The American Heritage® Stedman's Medical Dictionary
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