A specific poison, usually of an albuminous nature, esp. one produced by a microbe, which causes a particular disease when present in the system…

a substance that causes autointoxication; also figurative.

A substance that is toxic to the organism that produces it or to other organisms of the same species.

An antibody or other substance that has a toxic effect on cells; a cytotoxic agent.

(See quots.)

Originally: an antiserum produced by the injection of kidney tissue from one species into animals of another species, which causes kidney disease…

a modification of a toxon, in which the toxic properties are lost.

a toxin derived from an animal; cf. phytotoxin, n. 1.

any substance which destroys leucocytes.

A toxic alkaloid obtained from the toadstool Amanita phalloides; (now) spec. a cyclic oligopeptide, C35H48N8O11S, which is the principal phallotoxin.

A substance produced in an infected plant and involved in the disease process (see quot. 1953).

A toxin produced by the fungus Drechslera victoriae, the causative agent of a blight in some susceptible varieties of oats.

A toxic alkaloid, C35H48N8O10S, one of the phallotoxins.

Each of three neurotoxins isolated from the venom of the elapid snake Bungarus multicinctus; spec. α-bungarotoxin, which binds to acetylcholine…

A toxin that causes or helps to cause a disease in plants.

any of a class of sesquiterpenoids based on a tetracyclic ring system C15H22O2.