Chemistry oxalic acid n. a crystalline dibasic acid occurring in wood sorrel (Oxalis acetosella) and many other plants, which is toxic when ingested…

A toxic, colourless or yellowish, oily liquid alkaloid which is the chief active constituent of tobacco, acting as a stimulant in small doses…

Cacodyl, As(CH3)2; an impure form of this.

An old name for strychnine. Obsolete.

A quaternary ammonium base, C9H21NO3, found in the fly agaric (Amanita muscaria) and certain other fungi, which is a poisonous alkaloid which…

A poisonous crystalline base, C8H6N2.

A ptomaine of doubtful identity isolated from putrefying flesh.

the acid HN:C:O, which exists in equilibrium with cyanic acid (HO·CN).

An alkaloid derived from mescal buttons, having intoxicating and hallucinogenic properties similar to, but milder than, those of the drug LSD…

a non-volatile oil constituting the poisonous principle of Rhus Toxicodendron and other species.

curare kept or transported in bamboo tubes.

a poisonous stimulant alkaloid obtained from the garden tulip.

a toxic crystalline compound which is a fluorinated derivative of acetamide, used (esp. formerly) as an insecticide and rodenticide.

A poison found in the tentacles of sea-anemones.

= mustard gas, n.

A pale yellow, poisonous, vesicant oil with bacteriostatic and fungistatic properties, found in many plants of the family Ranunculaceae.

A dark oily liquid (colourless when pure) which is a powerful respiratory irritant and causes painful blisters on contact with the skin…

Any organic compound whose molecule contains one or more chlorine atoms as substituents, esp. an organochlorine pesticide. Frequently attributive.