Late 19th century; earliest use found in The Century Dictionary. From scientific Latin Petromyzont-, taken as stem of PetromyzonPetromyzon, after Petromyzontidae.
Definition of petromyzont in US English:
petromyzont
nounˌpɛtrə(ʊ)ˈmʌɪzɒnt
Zoology
= petromyzontid.
Origin
Late 19th century; earliest use found in The Century Dictionary. From scientific Latin Petromyzont-, taken as stem of Petromyzon Petromyzon, after Petromyzontidae.