petunia

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of various widely cultivated South American plants of the genus Petunia, having alternate, entire leaves and funnel-shaped flowers in colors from white to purple.
2. n. A moderate to dark purple.

Century Dictionary and Cyclopedia

1. n. A genus of ornamental plants of the gamopetalous order Solanaceæ and the tribe Salpiglossidæ, distinguished by the five perfect stamens, funnelform corolla, and entire capsule-valves. There are from 12 to 15 species, found in southern Brazil and the Argentine Republic, and one throughout South America and Mexico. They are clammy-hairy and branching herbs, with small undivided leaves, and showy violet or white flowers, varying to purple and reddish under cultivation, in a few species very small and inconspicuous. P. nyctaginiflora, the common white petunia, and P. violacea, with purple or lilac flowers, are the originals of the numerous garden varieties.
2. n. [lowercase] A plant of this genus.

Wiktionary

1. n. A genus of flowering plants, Petunia; most garden varieties are hybrids.
2. n. A dark purple colour, like that of some petunia flowers.
3. adj. Of a dark purple colour, like that of some petunia flowers.

GNU Webster's 1913

1. n. (Bot.) A genus of solanaceous herbs with funnelform or salver-shaped corollas. Two species are common in cultivation, Petunia violacera, with reddish purple flowers, and Petunia nyctaginiflora, with white flowers. There are also many hybrid forms with variegated corollas.

WordNet 3.0

1. n. any of numerous tropical herbs having fluted funnel-shaped flowers
2. n. annual or perennial herbs or shrubs of tropical South America