Dioscorea. Dioscorea villosa. Wild yam. N. O. Dioscoreaceae. Tincture of fresh root, or trituration of resinoid, Dioscorein.   Clinical.-Abdomen, distended. Acne. Angina pectoris. Biliousness. Cholerine. Chorea. Colds. Colic. Constipation. Cough.