Tobacco To*bac"co, n. [Sp. tabaco, fr. the Indian tabaco the tube or pipe in which the Indians or Caribbees smoked this plant. Some derive the word from Tabaco, a province of Yucatan, where it was said to be first found by the Spaniards; others from the island of Tobago, one of the Caribbees. But these derivations are very doubtful.] 1. (Bot.) An American plant (Nicotiana Tabacum) of the Nightshade family, much used for smoking and chewing, and as snuff. As a medicine, it is narcotic, emetic, and cathartic. Tobacco has a strong, peculiar smell, and an acrid taste. Note: The name is extended to other species of the genus, and to some unrelated plants, as Indian tobacco (Nicotiana rustica, and also Lobelia inflata), mountain tobacco (Arnica montana), and Shiraz tobacco (Nicotiana Persica). 2. The leaves of the plant prepared for smoking, chewing, etc., by being dried, cured, and manufactured in various ways. Tobacco box (Zo["o]l.), the common American skate. Tobacco camphor. (Chem.) See Nicotianine. Tobacco man, a tobacconist. [R.] Tobacco pipe. (a) A pipe used for smoking, made of baked clay, wood, or other material. (b) (Bot.) Same as Indian pipe, under Indian. Tobacco-pipe clay (Min.), a species of clay used in making tobacco pipes; -- called also cimolite. Tobacco-pipe fish. (Zo["o]l.) See Pipemouth. Tobacco stopper, a small plug for pressing down the tobacco in a pipe as it is smoked. Tobacco worm (Zo["o]l.), the larva of a large hawk moth (Sphinx, or Phlegethontius, Carolina). It is dark green, with seven oblique white stripes bordered above with dark brown on each side of the body. It feeds upon the leaves of tobacco and tomato plants, and is often very injurious to the tobacco crop. See Illust. of Hawk moth., Arnica Ar"ni*ca, n. [Prob. a corruption of ptarmica.] (Bot.) A genus of plants; also, the most important species (Arnica montana), native of the mountains of Europe, used in medicine as a narcotic and stimulant. Note: The tincture of arnica is applied externally as a remedy for bruises, sprains, etc., Arnicin Ar"ni*cin, n. [See Arnica.] (Chem.) An active principle of Arnica montana. It is a bitter resin., Bighorn Big"horn`, n. (Zo["o]l.) The Rocky Mountain sheep (Ovis or Caprovis montana)., Tramontana Tra`mon*ta"na, n. [It. See Tramontane.] (Meteor.) A dry, cold, violent, northerly wind of the Adriatic., Wych-elm Wych"-elm`, n. [OE. wiche a kind of elm, AS. wice a kind of tree. Cf. Wicker.] (Bot.) A species of elm (Ulmus montana) found in Northern and Western Europe; Scotch elm. Note: By confusion this word is often written witch-elm.