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hormone

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hor⋅mone

  [hawr-mohn]
Use hormone in a Sentence
–noun
1. 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.
2. Pharmacology. a synthetic substance used in medicine to act like such a compound when introduced into the body.
3. Botany. Also called phytohormone. any of various plant compounds, as auxin or gibberellin, that control growth and differentiation of plant tissue.
Origin:
1900–05; < Gk hormôn (prp. of hormân to set in motion, excite, stimulate), equiv. to horm() horme + -ōn prp. suffix, with ending assimilated to -one

Related forms:
hor⋅mo⋅nal, hor⋅mon⋅ic  [hawr-mon-ik, -moh-nik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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hor·mone   (hôr'mōn')   
n.  

    1. 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.

    2. 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-1 in Indo-European roots.]
hor·mon'al (-mō'nəl), hor·mon'ic (-mŏn'ĭk) adj., hor·mon'al·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

hormone 
1905, from Gk. hormon "that which sets in motion," prp. of horman "impel, urge on," from horme "onset, impulse." Used by Hippocrates to denote a vital principle; modern meaning coined by Eng. physiologist Ernest Henry Starling (1866-1927). Jung used horme (1915) in ref. to hypothetical mental energy that drives unconscious activities and instincts.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: hor·mone
Pronunciation: 'hor-"mOn
Function: noun
1 : a product of living cells that circulates in body fluids or sap and producesa specific effect on the activity of cells remote from its point of origin; especially : one exerting a stimulatory effect on a cellular activity called also internal secretion;—see PLANT HORMONE
2 : a synthetic substance that acts like a hormone —hor·mone·like /-"lIk/ adjective
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

hormone hor·mone (hôr'mōn')
n.
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.

hor·mon'al (-mō'nəl) adj.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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