An eel-like marsipobranch of the genus
Petromyzon, and allied genera; called also
lamprey eel and
lamper eel. The lampreys have a round, sucking mouth, without jaws, but set with numerous minute teeth, and one to three larger teeth on the palate (see
Illust. of
Cyclostomi). There are seven small branchial openings on each side. [
1913 Webster]