cephalaspid

Từ điển WordNet v3.1 - WordNet Dictionary

noun

extinct jawless fish of the Devonian with armored head
• Syn:
osteostracan
• Hypernyms:
jawless vertebrate, jawless fish, agnathan
• Member Holonyms:
Osteostraci, suborder Osteostraci, Cephalaspida, suborder Cephalaspida