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noun 
  1. (physiology) Any substance, produced by one tissue and conveyed by the bloodstream to another to effect physiological activity.
  2. (pharmacology) A synthetic compound with the same activity.
  3. Any similar substance in plants.
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".

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