Noun | 1. | ![]() rosid dicot genus - a genus of dicotyledonous plants boys-and-girls, herb mercury, herbs mercury, Mercurialis annua - Eurafrican annual naturalized in America as a weed; formerly dried for use as a purgative, diuretic or antisyphilitic dog mercury, dog's mercury, Mercurialis perennis - European perennial weedy plant with greenish flowers |