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单词 agnathan
释义
ag·na·than (ăgnə-thən)
n.
Any of various fishes lacking jaws, including the hagfishes and the lampreys and many extinct groups, such as the ostracoderms.

[A-1 + Greek gnathos, jaw; see genu-2 in the Appendix of Indo-European roots + -AN1.]

agna·than adj.
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