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A genus of biennial, poisonous, white-flowered, umbelliferous plants, bearing ribbed fruit ("seeds") and decompound leaves.

Conveying or generating disease; pestilential; poisonous; as, contagious air.

A white, crystalline, poisonous substance, regarded as a glucoside, extracted from the lily of the valley (Convallaria Majalis). Its taste is first bitter, then sweet.

A poisonous American serpent (Ancistrodon conotortrix), closely allied to the rattlesnake, but without rattles; -- called also copper-belly, and red viper.

A poisonous alkaloid extracted from corroval, and characterized by its immediate action in paralyzing the heart.

A poisonous umbelliferous plant; in England, the Cicuta virosa; in the United States, the Cicuta maculata and the Archemora rigida. See Water hemlock.

ia humboldtiana) of the southwestern United States and Mexico. Its berries are said to be poisonous to the coyote.

A genus of poisonous serpents, including the rattlesnakes.

A colorless, inflammable, poisonous gas, C2N2, with a peach- blossom odor, so called from its tendency to form blue compounds; obtained by heating ammonium oxalate, mercuric cyanide, etc. It is obtained in combination, forming an alkaline cyanide when nitrogen or a nitrogenous compound is strongly ignited with carbon a…

olium, esp. the Lolium temulentum (bearded darnel), the grains of which have been reputed poisonous. Other species, as Lolium perenne (rye grass or ray grass), and its variety L. Italicum (Italian rye grass), are highly esteemed for pasture and for making hay.

ortal. [Obs.] The image of a deadly man. Wyclif (Rom. i. 23). Deadly nightshade (Bot.), a poisonous plant; belladonna. See under Nightshade.

Destructive; poisonous. [Obs.] "Deletery medicines." Hudibras.

A poisonous alkaloid extracted from the stavesacre (Delphinium staphisagria), as a colorless amorphous powder.

ge. [Poetic & Rare] [Written also dispunge.] O sovereign mistress of true melancholy, The poisonous damp of night disponge upon me. Shak.

A small genus of perennial herbaceous plants, with poisonous milky juice, bearing slender pods pods in pairs.

rtain serpents; also, a nitrogenous base contained in this, and supposed to be the active poisonous principle of the virus. Brande & C.

Like or pertaining to the Elapidæ, a family of poisonous serpents, including the cobras. See Ophidia.

a. Fleas are destitute of wings, but have the power of leaping energetically. The bite is poisonous to most persons. The human flea (Pulex irritans), abundant in Europe, is rare in America, where the dog flea (P. canis) takes its place. See Aphaniptera, and Dog flea. See Illustration in Appendix. A flea in the ear, an…

ushroom (Agaricus muscarius), having a narcotic juice which, in sufficient quantities, is poisonous. -- Fly block (Naut.), a pulley whose position shifts to suit the working of the tackle with which it is connected; -- used in the hoisting tackle of yards. -- Fly board (Printing Press), the board on which printed she…

A poisonous mushroom (Amanita muscaria, syn. Agaricus muscarius), having usually a bright red or yellowish cap covered with irregular white spots. It has a distinct volva at the base, generally an upper ring on the stalk, and white spores. Called also fly agaric, deadly amanita.