Myriophyllum

noun
Myr·​i·​o·​phyl·​lum | \ ˌmirēōˈfiləm\

Definition of Myriophyllum

: a widely distributed genus of submerged aquatic plants (family Haloragaceae) having much-divided whorled or alternate leaves and emersed wind-pollinated flowers — see water milfoil

History and Etymology for Myriophyllum

New Latin, from Latin myriophyllon water milfoil, from Greek, from myrio- myri- + phyllon leaf

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