synapsida
synapsida

noun
extinct reptiles of the Permian to Jurassic considered ancestral to mammals 
WordNet® 3.0, © 2006 by Princeton University.
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Synapsida is always a great word to know.
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a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a gadget; dingus; thingumbob.
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