Etymology: From Ancient Greek (orme) "rapid motion forwards, onrush, onset, assault, impulse to do a thing, effort", from , (ormao, ormo) "to set in motion, to urge on, to cheer on, to make a start, to hasten on".
- (physiology) Any substance, produced by one tissue and conveyed by the bloodstream to another to effect physiological activity.
- (pharmacology) A synthetic compound with the same activity.
- Any similar substance in plants.
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Full Definition of hormone