noun
extinct group of armored jawless fishes or fish-like vertebrate; taxonomy is not clear
• Syn: ↑Heterostraci
• Hypernyms: ↑animal order
• Member Holonyms: ↑Ostracodermi, ↑order Ostracodermi
• Member Meronyms: ↑heterostracan
Useful english dictionary. 2012.