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The Collaborative International Dictionary

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.

  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.

  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]

  4. Marked by repeated cycles[2].

    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.


a. (context organic chemistry of a cyclic compound English) Having one or more atoms other than carbon in at least one of its rings. n. (context organic chemistry English) A heterocycle


adj. containing a closed ring of atoms of which at least one is not a carbon atom


n. a compound containing a heterocyclic ring [syn: heterocyclic compound, heterocycle]


Usage examples of "heterocyclic".

The unique heterocyclic structure of the tetrodotoxin molecule is selective for the sodium channels.

Pig was always wired, boringly religious about his heterocyclic chemistry: a bioresearch geek.

Pig was always wired, boringly religious about his heterocyclic chemistry: a bioresearch geek.