One of the mysteries of the English language finally explained.
A boxfish; (later) specifically one of the genus Ostracion. Now only (in form Ostracion): the genus itself.
Mid 17th century; earliest use found in Thomas Browne (1605–1682), physician and author. From post-classical Latin ostracion (Gesner 1558) from Hellenistic Greek ὀστράκιον shellfish, in ancient Greek small earthen vessel from ancient Greek ὄστρακον + -ιον, diminutive suffix.
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