bishop's weed noun5 •Aegopodium podagraria (ground elder, herb Gerard, bishop's goutweed, goutweed), a common weed of temperate regions. •Trachyspermum ammi (ajwain), of which the flower pods and leaves are used as a spice and herb in parts of Asia and Africa. •Visnaga daucoides (syn. Ammi visnaga); toothpickweed. •Ammi majus (false bishop's weed, laceflower), an umbelliferous plant of the genus Ammi. •Houttuynia cordata (heartleaf, lizard tail). formsbishop's weeds