Noun has 2 senses

• ageratum(n = noun.plant) conoclinium coelestinum, eupatorium coelestinum, mist-flower, mistflower - rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium;



• ageratum(n = noun.plant) - any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers;