One of the mysteries of the English language finally explained.
Of or relating to the family Unionidae of freshwater mussels, or the order Unionoida in which they are included; unioniform.
A mollusc of the family Unionidae or order Unionoida; a freshwater mussel.
Late 19th century; earliest use found in Henry Nicholson (1844–1899), biologist and geologist. From scientific Latin Unio unio + -oid, with insertion of -n- after classical Latin ūniōn-, ūniō, etymon of the first element.
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