One of the mysteries of the English language finally explained.
A fish of the family Petromyzontidae or superfamily Petromyzontoidea; a lamprey.
Mid 19th century; earliest use found in Theodore Gill (1837–1914). From scientific Latin Petromyzont- + -oid, after Petromyzontidae. In later use after scientific Latin Petromyzontoidea, superfamily name.
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