Urti'ca dioi'ca, Nettle (Stinging Nettle). -- Urticaceae; N. America, Europe. Plant .6-1 M. (2-3 degrees) high, very bristly, stinging, leaves ovate, heart-shaped, pointed, serrate, downy beneath, upper stem downy, spike much branched. Tonic, astringent, uterine hemorrhage. Dose, gr. 15-30 (1-2 Gm.).