quintupli- comb. form of quintuple a., employed in a few terms of Bot., as ˌquintupliˈcostate, -nerved, -ribbed, -veined. 1861[see quintuple 1 b].1880Gray Struct.Bot. 93 The appearance of a second pair of such strengthened veins makes the venation quintupli-ribbed or quintupli-nerved.