ˌēnəˈthirə, ēˈnäthərə noun
Usage: capitalized
Etymology: New Latin, from Latin oenothera, onothera, a plant of the genus Epilobium, from Greek oinothēras, onothēras
: a genus of mostly No. American annual or biennial herbs (family Onagraceae) having usually nocturnal yellow flowers with erect buds and terete seeds in two rows in a capsule — see evening primrose , kneiffia