Zoology. a simple sense organ usually consisting of one or a few cells at the peripheral end of a sensory nerve fiber.
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British Dictionary definitions for sensillum
a sense organ in insects, typically consisting of a receptor organ in the integument connected to sensory neurons
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012