Definition of Petromyzontidae
: a family of cyclostomes (order Hyperoartia) comprising elongated animals that resemble eels or hagfishes, have no barbels and seven pairs of circular gill openings, and feed on the blood of fishes which they obtain by rasping the flesh with their toothed circular mouth — see petromyzon — compare lamprey
petromyzontoidadjective or noun
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Origin and Etymology of petromyzontidae
New Latin, from Petromyzont-, Petromyzon, type genus + -idae
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