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Having the qualities or effects of poison; venomous; baneful; corrupting; noxious. Shak. -- Poi"son*ous*ly, adv. -- Poi"son*ous*ness, n.

pplied to any plant of the genus Aconitum (tribe Hellebore), all the species of which are poisonous.

An intensely poisonous alkaloid, extracted from aconite.

The poisonous herb aconite; also, an extract from it. Strong As aconitum or rash gunpowder. Shak.

lmond oil, fixed oil expressed from sweet or bitter almonds. -- Oil of bitter almonds, a poisonous volatile oil obtained from bitter almonds by maceration and distillation; benzoic aldehyde. -- Imitation oil of bitter almonds, nitrobenzene. -- Almond tree (Bot.), the tree bearing the almond. -- Almond willow (Bot.)…

A genus of poisonous fungi of the family Agaricaceæ, characterized by having a volva, an annulus, and white spores. The species resemble edible mushrooms, and are frequently mistaken for them. Amanita muscaria, syn. Agaricus muscarius, is the fly amanita, or fly agaric; and A. phalloides is the death cup.…

The poisonous principle of some fungi.

An acrid, poisonous, crystallizable substance, obtained from, the anemone, or from anemonin.

An acrid, poisonous, crystallizable substance, obtained from some species of anemone.

A disease due to inhaling the poisonous fumes present in the manufacture of aniline.

A poisonous principle obtained from antiar. Watts.

of, by giving or taking an antidote. Nor could Alexander himself . . . antidote . . . the poisonous draught, when it had once got into his veins. South.

an animal), capable of producing immunity from certain diseases, or of counteracting the poisonous effects of pathogenic bacteria.

A compound of arsenic and hydrogen, AsH3, a colorless and exceedingly poisonous gas, having and odor like garlic; arseniureted hydrogen.

A small, hooded, poisonous serpent of Egypt and adjacent countries, whose bite is often fatal. It is the Naja haje. The name is also applied to other poisonous serpents, esp. to Vipera aspis of southern Europe. See Haje.

A poisonous, white, crystallizable alkaloid, extracted from the Atropa belladonna, or deadly nightshade, and the Datura Stramonium, or thorn apple. It is remarkable for its power in dilating the pupil of the eye. Called also daturine.

Poisonous; malignant; malicious. [Obs.] Chaucer.

Of or pertaining to Avernus, a lake of Campania, in Italy, famous for its poisonous vapors, which ancient writers fancied were so malignant as to kill birds flying over it. It was represented by the poets to be connected with the infernal regions.

the order Ranunculaceæ, native in the north temperate zone. The red or white berries are poisonous.

Having poisonous qualities; deadly; destructive; injurious; noxious; pernicious. "Baneful hemlock." Garth. "Baneful wrath." Chapman. -- Bane"ful*ly, adv. --Bane"ful*ness, n.