pul·vi·nar·ia \ˌpəlvəˈna(a)rēə\noun Etymology: New Latin, from Latin pulvinus cushion + New Latin -aria; from the appearance of the egg case 1.capitalized: a genus of scales in which the females are large, flat, and nearly circular and secrete a cottony egg case — see cottony maple scale 2.-s: any insect of the genus Pulvinaria