Cyclostomata
noun plural
Cy·clo·sto·ma·ta
| \ ˌsī-klō-ˈstō-mət-ə
, ˌsik-lō-
, -ˈstäm-ət-ə\
, ˌsik-lō-
, -ˈstäm-ət-ə\
Medical Definition of Cyclostomata
: a class or order of primitive vertebrates that have a large jawless sucking mouth, no limbs or paired fins, a wholly cartilaginous skeleton with persistent notochord, and 6 to 14 pairs of gill pouches and that include the lampreys and the hagfishes — compare chondrichthyes