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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.
2. Any of various similar substances found in plants and insects that regulate development.
[From Greek hormōn, present participle of hormān, to urge on, from hormē, impulse; see er- in Indo-European roots.]
hor·mon′al (-mō′nəl), hor·mon′ic (-mŏn′ĭk) adj.
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|Adj.||1.||hormonal - of or relating to or caused by hormones; "hormonal changes"|