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Hormone definition, Biochemistry. any of various internally secreted compounds, as insulin or thyroxine, formed in endocrine glands, that affect the functions of specifically receptive organs or tissues when transported to them by the body fluids. Pharmacology. a synthetic substance used in medicine to act like such a compound when introduced into the body.
A hormone is a chemical substance produced in the body that controls and regulates the activity of certain cells or organs. These hormones are the messengers of the endocrine system, influencing such things as metabolic activity, reproduction, mood, growth and body development.It's interesting that the word hormone is derived from the Greek hormao meaning I set in motion or I stir up.This is exactly what hormones do. hormone is a chemical substance produced in the body that controls and regulates the activity of certain cells or organs. These hormones are the messengers of the endocrine system, influencing such things as metabolic activity, reproduction, mood, growth and body development.