[in-ter-noo r-on, -nyoo r-]
noun Cell Biology.
  1. any neuron having its cell body, axon, and dendrites entirely within the central nervous system, especially one that conveys impulses between a motor neuron and a sensory neuron.

Origin of interneuron

First recorded in 1935–40; inter- + neuron
Related formsin·ter·neu·ro·nal [in-ter-noo r-uh-nl, -nyoo r-, -noo-rohn-l, -nyoo-] /ˌɪn tərˈnʊər ə nl, -ˈnyʊər-, -nʊˈroʊn l, -nyʊ-/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for interneuron


  1. physiol any neuron that connects afferent and efferent neurons in a reflex arcAlso called: internuncial neuron
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

Word Origin and History for interneuron

1939, from internuncial + neuron.

Online Etymology Dictionary, © 2010 Douglas Harper

interneuron in Medicine


  1. A nerve cell found entirely within the central nervous system that acts as a link between sensory neurons and motor neurons.
Related formsin′ter•neuro•nal (-nurə-nəl, -nu-rō-) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.