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.

Look at other dictionaries:

  • heterocyclic — [het΄ər ōsīk′lik] adj. [ HETERO + CYCLIC] of or relating to certain cyclic compounds with a ring composed of carbon atoms and those of any other element or elements …   English World dictionary

  • heterocyclic — het·ero·cy·clic .het ə rō sī klik, sik lik adj relating to, characterized by, or being a ring composed of atoms of more than one kind <heterocyclic chemical compounds> heterocyclic n HETEROCYCLE * * * het·ero·cyc·lic (het″ər o… …   Medical dictionary

  • heterocyclic — adjective Etymology: International Scientific Vocabulary Date: 1899 relating to, characterized by, or being a ring composed of atoms of more than one kind • heterocycle noun • heterocyclic noun …   New Collegiate Dictionary

  • heterocyclic — heterocycle /het euhr euh suy keuhl/, n. /het euhr euh suy klik, sik lik/, adj. Chem. 1. of or pertaining to the branch of chemistry dealing with cyclic compounds in which at least one of the ring members is not a carbon atom (contrasted with… …   Universalium

  • heterocyclic — 1. adjective Having one or more atoms other than carbon in at least one of its rings. See Also: heterocycle 2. noun A heterocycle …   Wiktionary

  • heterocyclic — adj. (Chemistry) of or pertaining to chemical compounds containing rings of more than one type of atom; of or pertaining to the branch of chemistry which studies such compounds …   English contemporary dictionary

  • heterocyclic — [ˌhɛt(ə)rə(ʊ) sʌɪklɪk, sɪklɪk] adjective Chemistry denoting a compound whose molecule contains a ring of atoms of at least two elements (one of which is generally carbon) …   English new terms dictionary

  • heterocyclic — het·ero·cyclic …   English syllables

  • heterocyclic — het•er•o•cy•clic [[t]ˌhɛt ər əˈsaɪ klɪk, ˈsɪk lɪk[/t]] adj. 1) chem. of or pertaining to the branch of chemistry dealing with cyclic compounds in which at least one of the ring members is not a carbon atom 2) chem. noting such compounds •… …   From formal English to slang

  • heterocyclic — /hɛtəroʊˈsaɪklɪk/ (say hetuhroh suyklik), / ˈsɪklɪk/ (say siklik) –noun 1. Chemistry an organic compound with one or more rings which contain at least one atom which is not carbon (most commonly nitrogen, oxygen or sulphur). –adjective 2.… …   Australian English dictionary

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