a common, weedy plant (Linaria vulgaris) of the figwort family, with spurred orange and yellow flowers
See butter-and-eggs in American Heritage Dictionary 4
plural noun(used with a sing. or pl. verb)
A weedy perennial herb (Linaria vulgaris) native to Eurasia, having narrow leaves and racemes of showy, long-spurred yellow and orange flowers. Also called toadflax.