A nerve fiber or neuron that has two axons extending from it, rather than the typical one.
From 'di-' (two) and 'axon' (nerve fiber extension), Greek-derived combining form describing neurons with dual output extensions.
Most neurons follow the rule of one axon per cell, so finding a diaxon is like discovering a neuron that broke the rulebook—it's biologically unusual and suggests something interesting is happening in that nerve cell.
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