Definition of ageratum
plural ag·er·a·tum also ag·er·a·tums
: any of a genus (Ageratum) of annual tropical American composite herbs often cultivated for their small showy heads of usually blue or white flowers; also : a related blue-flowered perennial (Eupatorium coelestinum)
Origin of ageratum
New Latin, genus name, from Greek agēratos ageless, from a- + gēras old age — more at geront-
First Known Use: 1866
Learn More about ageratum
Britannica.com: Encyclopedia article about "ageratum"
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