Jisho

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たんきゅうるい 単弓類
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Noun
1. synapsids; theropsids​
Noun
2. mammal-like reptiles​Obsolete term, See also 哺乳類型爬虫類
Wikipedia definition
3. Synapsid​Synapsids ('fused arch') are a group of animals that includes mammals and every animal more closely related to mammals than to other living amniotes. They are easily separated from other amniotes by having a temporal fenestra, an opening low in the skull roof behind each eye, leaving a bony arch beneath each; this accounts for their name. Primitive synapsids are usually called pelycosaurs; more advanced mammal-like ones, therapsids.
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