: an angiospermous plant (such as a deciduous tree or broad-leaved herb) having an embryo with two cotyledons, leaves with typically reticulate venation, and floral organs usually arranged in multiples of four or five : dicotyledon
And of the two great groups of plants, monocots and dicots, the monocots (the grasses and their ilk) do share a single ancestor, but the dicots do not, which means they are not a natural grouping. Steve Hatch
—often used before another noun
dicot speciesMost leaves and petrified wood from late Cretaceous and younger rocks are of dicot flowering plants. Alan M. Cvancara