sense organ

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A specialized organ or structure, such as the eye, ear, tongue, nose, or skin, where sensory neurons are concentrated and that functions as a receptor.

from The Century Dictionary.

• noun Any organ of sense, as the eye, ear, or nose.
• noun Specifically, a collection of nerve-cells which receive impressions from without (peripheral sense-organ), such as one of the taste-bulbs or tactile corpuscles; also a collection of nerve-cells in the cerebrospinal centers which translate such impressions into conscious sensation or reflex movement (central sense-organ).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun an organic sensor.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation