(from the article `neurotransmitter`) The site where neurons meet is called the synapse and consists of the axon terminal (transmitting end) of one cell and the dendrite (receiving end) ... The presynaptic terminal is unmyelinated and is separated from the neuron or muscle cell onto which it impinges by a gap called the synaptic cleft, ...
The gap between the two neurons at a given synapse.
<physiology> The narrow space between the presynaptic cell and the postsynaptic cell in a chemical synapse, across which the neurotransmitter diffuses. ... (10 Jan 1998) ... 
The narrow space between the presynaptic cell and the postsynaptic cell in a chemical synapse, across which the neurotransmitter diffuses.
Type: Term Definitions: 1. the space about 10-20 nm wide between the axolemma and the postsynaptic surface.
Synaptic cleft: The tiny space between two nerve cells across which the neurotransmitter acetylcholine diffuses.
The space between an axon terminal and the myofiber it supplies, and across which the nerve impulse is transmitted by means of "messenger molecules" such as acetylcholine.
the small gap, measured in nanometers, between an axon terminal and any of the cell membranes in the immediate vicinity.
The gap between two cells at a synapse.