The plural form of axonium; the condition of possessing an axon or axons, or the collection of axons in a structure.
From Greek 'axon' (axis) with the Latin feminine plural suffix '-ia,' creating a term for the state or condition of having axons.
This is a wonderfully obscure medical term that essentially means 'axon-ness'—it captures the idea that some structures are defined entirely by whether they have axons or not.
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