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1540s, from Latin squamosus "covered with scales, scaly," from squama "scale," perhaps related to squalus "foul, filthy" (see squalid). Middle English had squame (late 14c.) "a scale," from Old French esquame, from Latin squama.
squamous squa·mous (skwā'məs, skwä'-) or squa·mose (-mōs')
Covered with or formed of scales; scaly.
Resembling a scale or scales; thin and flat.