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 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.
From the genus name.