Noun | 1. | ![]() dicot genus, magnoliopsid genus - genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination family Hippocastanaceae, Hippocastanaceae, horse-chestnut family - trees having showy flowers and inedible nutlike seeds in a leathery capsule Aesculus hippocastanum, horse chestnut, buckeye - tree having palmate leaves and large clusters of white to red flowers followed by brown shiny inedible seeds |