petunia

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various widely cultivated South American plants of the genus Petunia of the nightshade family, having funnel-shaped flowers in a variety of colors.
• noun A moderate to dark purple.

from The Century Dictionary.

• noun 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.
• noun [lowercase] A plant of this genus.

from the GNU version of the Collaborative International Dictionary of English.

• noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A genus of flowering plants, Petunia; most garden varieties are hybrids.
• noun A dark purple colour, like that of some petunia flowers.
• adjective Of a dark purple colour, like that of some petunia flowers.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of numerous tropical herbs having fluted funnel-shaped flowers
• noun annual or perennial herbs or shrubs of tropical South America