melatonin
noun Etymology: Greek melas black + -tonin (as in serotonin) Date: 1958 a vertebrate hormone that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation of circadian rhythms

New Collegiate Dictionary. 2001.

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  • melatonin — mel a*tonin n. (Physiology) A hormone secreted by the pineal gland. Chemically it is N acety 5 methoxytryptamine. Research has indicated that there are daily rhythms in secretion of melatonin, in particular due to the depressing effect on… …   The Collaborative International Dictionary of English

  • Melatonin — Melatonin, 5 Methoxy N Acetyltryptamin, im Pinealorgan bzw. der Epiphyse nachgewiesenes, durch N Acetylierung und 5 Methylierung aus Serotonin entstehendes Hormon; bewirkt bei Fischen und Froschlurchen als Gegenspieler des ⇒… …   Deutsch wörterbuch der biologie

  • melatonin — (n.) 1958, from Gk. melas black, dark (see MELANIN (Cf. melanin)) + ending from SEROTONIN (Cf. serotonin). So called because its secretion is inhibited by sunlight …   Etymology dictionary

  • melatonin — [mel΄ə tō′nin] n. [ MELA(NO) + TON(IC) + IN1] a hormone, C13H16N2O2, produced by the pineal body, that lightens skin pigmentation, inhibits estrus, etc.: its secretion is inhibited by sunlight …   English World dictionary

  • Melatonin — Not to be confused with Melanin or Melanotan. Melatonin Systematic (IUPAC) name …   Wikipedia

  • Melatonin — Strukturformel Allgemeines Name Melatonin Andere Namen N …   Deutsch Wikipedia

  • melatonin — /mel euh toh nin/, n. Physiol. a hormone secreted by the pineal gland in inverse proportion to the amount of light received by the retina, important in the regulation of biorhythms: in amphibians, it causes a lightening of the skin. [1955 60; <… …   Universalium

  • Melatonin — A hormone produced by the pineal gland, melatonin is intimately involved in regulating the sleeping and waking cycles, among other processes. Melatonin supplements are sometimes used by people who have chronic insomnia. Always see your doctor… …   Medical dictionary

  • Melatonin — Me|la|to|nin 〈n. 15; unz.; Biol., Med.〉 Hormon der Zirbeldrüse, das bei Amphibien zu einer Aufhellung der Haut führt u. beim Menschen an der Regulation des biolog. Zeitsinnes beteiligt ist [<Melano... + grch. tonos „Spannung“] * * *… …   Universal-Lexikon

  • melatonin — n. a hormone produced by the pineal gland in darkness but not in bright light. Melatonin receptors in the brain, in a nucleus immediately above the optic chiasm, react to this hormone and synchronize the nucleus to the 24 hour day/night rhythm,… …   The new mediacal dictionary

  • melatonin — melatoninas statusas T sritis chemija apibrėžtis Kankorėžinės liaukos hormonas. formulė C₈H₅N(OCH₃)CH₂CH₂NHCOCH₃ atitikmenys: angl. melatonin rus. мелатонин ryšiai: sinonimas – 3 (2 etanoilaminoetil) 5 metoksiindolas …   Chemijos terminų aiškinamasis žodynas

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