| agglutinin | (noun) an antibody that causes agglutination of a specific antigen | - |
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| angiotonin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotensin, Hypertensin |
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| antivenin | (noun) an antitoxin that counteracts the effects of venom from the bite of a snake or insect or other animal | Synonyms: antivenene |
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| calcitonin | (noun) thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone | Synonyms: thyrocalcitonin |
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| carrageenin | (noun) a colloidal extract from carrageen seaweed and other red algae | Synonyms: carrageenan |
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| cholecystokinin | (noun) a gastrointestinal hormone that stimulates the secretion of pancreatic enzymes and the contraction and emptying of the gall bladder; its release is stimulated by the presence of fatty acids and amino acids in the small intestine | - |
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| cytokinin | (noun) any of a class of plant hormones that promote cell division and delay the senescence of leaves | Synonyms: kinin |
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| isoagglutinin | (noun) an antibody produced by one individual that causes agglutination of red blood cells in other individuals of the same species | - |
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| kinin | (noun) any of a class of plant hormones that promote cell division and delay the senescence of leaves | Synonyms: cytokinin |
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| lignin | (noun) a complex polymer; the chief constituent of wood other than carbohydrates; binds to cellulose fibers to harden and strengthen cell walls of plants | - |
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| linin | (noun) an obsolete term for the network of viscous material in the cell nucleus on which the chromatin granules were thought to be suspended | - |
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| melanin | (noun) insoluble pigments that account for the color of e.g. skin and scales and feathers | - |
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| melatonin | (noun) hormone secreted by the pineal gland | - |
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| opsonin | (noun) an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes | - |
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| phycocyanin | (noun) blue pigment in algae | - |
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| pyocyanin | (noun) a toxic blue crystalline antibiotic found in green pus | - |
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| renin | (noun) a proteolytic enzyme secreted by the kidneys; catalyzes the formation of angiotensin and thus affects blood pressure | - |
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| rennin | (noun) an enzyme that occurs in gastric juice; causes milk to coagulate | Synonyms: chymosin |
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| safranin | (noun) any of a class of chiefly red organic dyes | Synonyms: saffranine, safranine |
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| saligenin | (noun) Salicylic alcohol, also called saligenin, is a crystalline phenolic alcohol with the chemical formula C7H8O2, that is obtained usually by hydrolysis of salicin. | Synonyms: salicylic alcohol |
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| saponin | (noun) any of various plant glucosides that form soapy lathers when mixed and agitated with water; used in detergents and foaming agents and emulsifiers | - |
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| serotonin | (noun) a neurotransmitter involved in e.g. sleep and depression and memory | Synonyms: 5-hydroxytryptamine |
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| tannin | (noun) any of various complex phenolic substances of plant origin; used in tanning and in medicine | Synonyms: tannic acid |
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| thyrocalcitonin | (noun) thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone | Synonyms: calcitonin |
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