any of several plants (genus Ageratum) of the composite family with small, thick heads of usually bluish flowers: widely used as border plants in gardens
Origin of ageratumModern Latin ; from Classical Greek ag?raton, a kind of plant ; from ag?ratos, not growing old ; from a-, not + g?ras, old age
- Any of various tropical American plants of the genus Ageratum in the composite family, especially A. houstonianum, cultivated for their fluffy blue, purple, pink, or white flower heads.
- Any of several other plants having flower clusters similar to those of ageratum.
Origin of ageratumNew Latin Ag&emacron;ratum, genus name, from Greek ag&emacron;raton, a plant (perhaps a type of rosemary), neuter of ag&emacron;ratos, ageless : a-, without; see a–1 + g&emacron;ras, old age; see ger&schwa;-1 in Indo-European roots.
From the genus name.