Either of two North American lilies, the Canada lily, Lilium canadense, with nodding yellow flowers, and (now rare) the wood lily, L. pennsylvanicum, with upright red flowers.
Origin
Mid 19th century; earliest use found in William D. Williamson (1779–1846).
Definition of meadow lily in US English:
meadow lily
noun
North American
Either of two North American lilies, the Canada lily, Lilium canadense, with nodding yellow flowers, and (now rare) the wood lily, L. pennsylvanicum, with upright red flowers.
Origin
Mid 19th century; earliest use found in William D. Williamson (1779–1846).