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)