Main Entry:

ag·er·a·tum

Pronunciation:

\ˌa-jə-ˈrā-təm\

Function:

noun

Inflected Form(s):

plural ag·er·a·tum also ag·er·a·tums

Etymology:

New Latin, genus name, from Greek agēratos ageless, from a- + gēras old age — more at geront-

Date:

1866

: 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)