toxin(redirected from diphtheria toxin for Schick test)
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1. A poisonous substance, especially a protein, that is produced by living cells or organisms and is capable of causing disease when introduced into the body tissues but is often also capable of inducing neutralizing antibodies or antitoxins.
2. A poisonous or harmful nonbiological substance, such as a pollutant.
any poison produced by an organism, including the bacterial toxins that are the causative agents of tetanus, diphtheria, etc., and such plant and animal toxins as ricin and snake venom.
syn: See poison.
A poisonous substance produced by a living organism. Toxins can be products of ordinary metabolism (such as lactic acid), can be produced to kill or immobilize prey (such as the toxins in snake venom), or can be produced for self-defense (such as the cyanide produced by several plants). Toxins produced by bacteria cause disease.
See: toxin agent.
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|Noun||1.||toxin - a poisonous substance produced during the metabolism and growth of certain microorganisms and some higher plant and animal species|
ricin, ricin toxin - a toxic protein extracted from castor beans; used as a chemical reagent; can be used as a bioweapon; "one milligram of ricin can kill an adult"
poison, poisonous substance, toxicant - any substance that causes injury or illness or death of a living organism
animal toxin, zootoxin - a toxin resembling bacterial toxins in its antigenic properties that is found in the fluids of certain animals
bacterial toxin - any endotoxin or exotoxin formed in or elaborated by bacterial cells
cytotoxin - any substance that has a toxic effect on cells
endotoxin - a toxin that is confined inside the microorganisms and is released only when the microorganisms are broken down or die
exotoxin - a toxin that is secreted by microorganisms into the surrounding medium
hepatotoxin - any toxin that affects the liver
nephrotoxin - any toxin that affects the kidneys