- The definition of a hormone is a substance formed in an organ or tissue in the body of a plant or animal and then transported by body fluid to another organ or tissue for a specific action.
An example of a hormone is estrogen in humans.
- a substance formed in some organ of the body, as the adrenal glands, the pituitary, etc., and carried by a body fluid to another organ or tissue, where it has a specific effect: now often prepared synthetically
- a similar substance produced in a plant, as an auxin
Origin of hormone; from Classical Greek hormōn, present participle of horman, to stimulate, excite ; from hormē, impulse ; from Indo-European base an unverified form ser-, to stream from source Sanskrit sará-, fluid, Classical Latin serum, whey
- a. A substance, usually a peptide or steroid, produced by one tissue and conveyed by the bloodstream to another to effect physiological activity, such as growth or metabolism.b. A synthetic compound that acts like a hormone in the body.
- Any of various similar substances found in plants and insects that regulate development.
Origin of hormoneFrom Greek hormōn, present participle of hormān, to urge on, from hormē, impulse; see er-1 in Indo-European roots.
- hor·mon′al , hor·mon′ic
From Ancient Greek ὁρμή (horme, “rapid motion forwards, onrush, onset, assault, impulse to do a thing, effort”), from ὁρμάω (hormao), ὁρμῶ (hormo, “to set in motion, to urge on, to cheer on, to make a start, to hasten on”).