| angiotonin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotensin, Hypertensin |
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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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| 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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| 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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| 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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