Hormone Hor"mone (h[^o]r"m[=o]n), n. [From Gr. "orma`ein to excite.] 1. (Physiological Chem.) A chemical substance formed in one organ and carried in the circulation to another organ on which it exerts a specific effect on cells at a distance from the producing cells; thus, pituitary hormones produced in the brain may have effects on cells in distant parts of the body.. [Webster 1913 Suppl. +PJC]

2. (Physiological Chem.) a chemical substance, whether natural or synthetic, that functions like a hormone in a living organism. Thus, synthetic steroid hormones may be more effective than their natural counterparts. [PJC]

3. (Bot.) A substance that controls growth rate or differentiation in plants; also called {phytohormone}. The most well-known are the {auxins} that stimulate growth at the growing tips of plants, and control root formation and the dropping of leaves; and the {gibberellins}, which are used in agriculture to promote plant growth. [PJC]

The Collaborative International Dictionary of English. 2000.

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  • Hormone — Hormone …   Deutsch Wörterbuch

  • hormone — [ ɔrmɔn; ɔrmon ] n. f. • 1911; en angl. (1905); du gr. hormôn « exciter » ♦ Substance chimique élaborée par un groupe de cellules ou un organe, et qui exerce une action spécifique sur un autre tissu ou un autre organe. Les hormones sont… …   Encyclopédie Universelle

  • Hormone — Hormone, der interzellulären und bisweilen auch der intrazellulären Kommunikation dienende, von endokrinen Organen oder Einzelzellen gebildete Botenstoffe der Metazoen, die spezifische Funktionen von Zielzellen regeln. Die klassische Definition,… …   Deutsch wörterbuch der biologie

  • hormone — (n.) 1905, from Gk. hormon that which sets in motion, prp. of horman impel, urge on, from horme onset, impulse, from PIE *or sma , from root *er to move, set in motion. Used by Hippocrates to denote a vital principle; modern meaning coined by… …   Etymology dictionary

  • hormone — ► NOUN ▪ a substance produced by a living thing and transported in tissue fluids to specific cells or tissues to stimulate them into action. DERIVATIVES hormonal adjective. ORIGIN Greek horm n setting in motion …   English terms dictionary

  • hormone — [hôr′mōn΄] n. [< Gr hormōn, prp. of horman, to stimulate, excite < hormē, impulse < IE base * ser , to stream > Sans sará , fluid, L serum, whey] 1. a substance formed in some organ of the body, as the adrenal glands, the pituitary,… …   English World dictionary

  • hormone — hormonal, hormonic /hawr mon ik, moh nik/, adj. /hawr mohn/, n. 1. Biochem. any of various internally secreted compounds, as insulin or thyroxine, formed in endocrine glands, that affect the functions of specifically receptive organs or tissues… …   Universalium

  • Hormone — Hormones (from Greek Polytonic|ὁρμή impetus ) are chemicals released by cells that affect cells in other parts of the body. Only a small amount of hormone is required to alter cell metabolism. It is also a chemical messenger that transports a… …   Wikipedia

  • Hormone — Epinephrin (Adrenalin), ein Hormon aus der Gruppe der Katecholamine Hormone (von altgriechisch ὁρμᾶν hormān ‚antreiben, erregen‘)[1] sind (bei unterschiedlicher Definition) biochemische …   Deutsch Wikipedia

  • Hormone — I Hormone,   Bezeichnung für körpereigene Wirkstoffe, auch als »Informationsüberträger« oder »chemische Sendboten« bezeichnet, die spezifisch auf bestimmte Organe einwirken. Die Hormone werden mit dem Blut transportiert, koppeln im Gewebe an für… …   Universal-Lexikon

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