One of the mysteries of the English language finally explained.
Designating each of the sacs or tubes connected with the circular vessel of the water-vascular system in many echinoderms. Chiefly in "Polian vesicle".
Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From the name of Giuseppe Saverio Poli, Neapolitan doctor and naturalist + -an.
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