jawless vertebrate

Từ điển WordNet v3.1 - WordNet Dictionary

noun

eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms
• Syn:
jawless fish, agnathan
• Hypernyms:
aquatic vertebrate
• Hyponyms:
ostracoderm, heterostracan, osteostracan, cephalaspid, anaspid,
conodont, cyclostome, lamprey, lamprey eel, lamper eel, hagfish,
hag, slime eels
• Member Holonyms:
Agnatha, superclass Agnatha