One of the mysteries of the English language finally explained.
Of a sponge spicule, coral sclerite, etc.: that has a single axis; = monaxon.
Late 19th century; earliest use found in Encyclopaedia Britannica. From ancient Greek μόνος + ἀξον-, ἄξων axis + -ic, probably after scientific Latin Monaxonida, order name, or Monaxona, former order name.
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