名詞 cyclostome:

1. primitive aquatic vertebrate

cy.clo.stome

n.（名詞）
Any of various primitive eellike vertebrates of the class Agnatha, such as a lamprey, lacking jaws and true teeth and having a circular, sucking mouth.
圓口綱脊椎動物：一種類似鰻魚的無顎綱原始脊椎動物，如盲鰻，沒有下顎和真正的牙齒，而長著圓形吮吸的嘴

來源：
From New Latin Cyclostomo
源自 現代拉丁語 Cyclostomo
Cyclostomata [class names]
Cyclostomata [綱名]
cyclo-
cyclo-
Greek stoma stomat- [mouth]
希臘語 stoma stomat- [嘴]

【引伸】
cyclos.tomate.