from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of various New World plants of the genus Ageratum in the composite family, especially A. houstonianum, having showy, colorful flower heads.
- n. Any of several other plants having flower clusters similar to the ageratum.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of the genus Ageratum of tropical American herbs, annuals and perennials, from the sunflower family Asteraceae, tribe Eupatorieae; they are sometimes used in floral displays.
from The Century Dictionary and Cyclopedia
- n. A genus of plants, natural order Compositæ, all American and chiefly tropical, nearly allied to Eupatorium.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium
- n. any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers
New Latin Agēratum, genus name, from Greek agēraton, a plant (perhaps a type of rosemary), neuter of agēratos, ageless : a-, without; see a-1 + gēras, old age; see gerə-1 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From the genus name. (Wiktionary)