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单词 therapsid
释义
the·rap·sid (thə-răpsĭd)
n.
Any of various amniote vertebrates that emerged in the Permian Period and diversified in the Triassic, including the mammals, their ancestors, and their relatives.

[From New Latin Thērapsida, order name : Greek thēr, wild animal; see THEROPOD + Greek hapsis, hapsid-, arch, vault (from the enlarged lower temporal opening characteristic of the group); see APSIS.]

the·rapsid adj.
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