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.

Look at other dictionaries:

  • Phytohormone — (griechische Einzahl φυτοορμόνη, fitoormóni, „Pflanzenhormon“) sind biochemisch wirkende pflanzeneigene (endogene) organische Verbindungen, die als Botenstoffe (sog. Signalmoleküle) Wachstum und Entwicklung der Pflanzen steuern und koordinieren.… …   Deutsch Wikipedia

  • phytohormone — [ fitoɔrmɔn; mon ] n. f. • 1953; phythormone av. 1949; de phyto et hormone ♦ Biol. Hormone végétale. ● phytohormone nom féminin Hormone végétale. Hormone de synthèse utilisée comme herbicide. p …   Encyclopédie Universelle

  • Phytohormone — Phytohormone,   die Pflanzenhormone …   Universal-Lexikon

  • Phytohormone — Phytohormone, Pflanzenhormone, Botenstoffe, die in vielzelligen Pflanzen an der interzellulären Regulation beteiligt sind und Wachstums und Differenzierungsprozesse beeinflussen. P. sind Gewebshormone; meistens müssen sie in der Pflanze von ihrem …   Deutsch wörterbuch der biologie

  • phytohormone — [fīt΄ō hôr′mōn΄] n. PLANT HORMONE …   English World dictionary

  • Phytohormone — Une phytohormone, ou hormone végétale, est une hormone produite par une plante. C est une substance chimique organique qui régule la croissance végétale ou qui intervient dans la communication entre individus végétaux différents (un arbre stressé …   Wikipédia en Français

  • phytohormone — noun Etymology: International Scientific Vocabulary Date: 1933 plant hormone …   New Collegiate Dictionary

  • phytohormone — /fuy teuh hawr mohn/, n. hormone (def. 3). [1930 35; PHYTO + HORMONE] * * * …   Universalium

  • phytohormone — noun A plant hormone …   Wiktionary

  • phytohormone — phy·to·hor·mone fīt ə hȯr .mōn n PLANT HORMONE …   Medical dictionary

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