plant (an organism of the kingdom Plantae, and now specifically, a living organism of the Embryophyta (land plants) or of the Chlorophyta (green algae), a eukaryote that includes double-membraned chloroplasts in its cells containing chlorophyll a and b, or any organism closely related to such an organism); plant (factory); floor, level (of a high building); sole; sole (bottom of a shoe or boot)