the small gap, measured in nanometers, between an axon terminal and any of the cell membranes in the immediate vicinity.
Origin of synaptic cleft
First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Medicine definitions for synaptic cleft
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.