Biochemistry. any of a group of corticosteroid hormones, synthesized by the adrenal cortex, that regulate the excretion or reabsorption of sodium and potassium by the kidneys, salivary glands, and sweat glands.
Pharmacology. any of various natural or synthetic drugs having mineralocorticoid activity.

1945–50; mineral + -o- + cortic(o)- + -oid

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World English Dictionary
mineralocorticoid (ˌmɪnərələʊˈkɔːtɪˌkɔɪd)
any corticosteroid that controls electrolyte and water balance, esp by promoting retention of sodium by the kidney tubules

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Medical Dictionary

mineralocorticoid min·er·al·o·cor·ti·coid (mĭn'ər-ə-lō-kôr'tĭ-koid')
Any of a group of steroid hormones that are secreted by the adrenal cortex and regulate the balance of water and electrolytes in the body.

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