heterocyclic

heterocyclic
Cyclic Cyc"lic (s?k"l?k or s?"kl?k), Cyclical Cyc"lic*al (s?k"l?-kal), a. [Cf. F. cycluque, Gr. kykliko`s, fr. ky`klos See {Cycle}.] 1. Of or pertaining to a cycle or circle; moving in cycles; as, cyclical time. --Coleridge. [1913 Webster]

2. (Chemistry) Having atoms bonded to form a ring structure. Opposite of {acyclic}.

Note: Used most commonly in respect to organic compounds.

Note: [Narrower terms: {bicyclic}; {heterocyclic}; {homocyclic, isocyclic}]

Syn: closed-chain, closed-ring. [WordNet 1.5]

3. Recurring in cycles[2]; having a pattern that repeats at approximately equal intervals; periodic. Opposite of {noncyclic}.

Note: [Narrower terms: {alternate(prenominal), alternating(prenominal)}; {alternate(prenominal), every other(prenominal), every second(prenominal)}; {alternating(prenominal), oscillating(prenominal)}; {biyearly}; {circadian exhibiting 24-hour periodicity)}; {circular}; {daily, diurnal}; {fortnightly, biweekly}; {hourly}; {midweek, midweekly}; {seasonal}; {semestral, semestrial}; {semiannual, biannual, biyearly}; {semiweekly, biweekly}; {weekly}; {annual, yearly}; {biennial}; {bimonthly, bimestrial}; {half-hourly}; {half-yearly}; {monthly}; {tertian, alternate(prenominal)}; {triennial}] [WordNet 1.5]

4. Marked by repeated cycles[2]. [WordNet 1.5]

{Cyclic chorus}, the chorus which performed the songs and dances of the dithyrambic odes at Athens, dancing round the altar of Bacchus in a circle.

{Cyclic poets}, certain epic poets who followed Homer, and wrote merely on the Trojan war and its heroes; -- so called because keeping within the circle of a single subject. Also, any series or coterie of poets writing on one subject. --Milman. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Heterocyclic compound — Heterocyclic compounds are organic compounds containing at least one atom of carbon, and at least one element other than carbon, such as sulfur, oxygen or nitrogen within a ring structure .cite book author = Eicher, T.; Hauptmann, S. title = The… …   Wikipedia

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  • heterocyclic amino acid — heterocyclic amino acid. См. гетероциклическая аминокислота. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • heterocyclic compound — heterocyclic compound. См. гетероциклическое соединение. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • heterocyclic amine — n an amine containing one or more closed rings of carbon and nitrogen esp any of various carcinogenic amines that are formed when creatine or creatinine reacts with free amino acids and sugar in meat cooked at high temperature abbr. HCA …   Medical dictionary

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