| acyclic | (adjective) not cyclic; especially having parts arranged in spirals rather than whorls | - |
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| (adjective) having an open chain structure | Synonyms: open-chain |
| acyclovir | (noun) an oral antiviral drug (trade name Zovirax) used to treat genital herpes; does not cure the disease but relieves the symptoms | Synonyms: Zovirax |
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| anticyclone | (noun) (meteorology) winds spiraling outward from a high pressure center; circling clockwise in the Northern Hemisphere and counterclockwise in the southern | - |
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| anticyclonic | (adjective) of or relating to or characteristic of the atmosphere around a high pressure center | - |
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| bicycle | (noun) a wheeled vehicle that has two wheels and is moved by foot pedals | Synonyms: bike, cycle, wheel |
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| (verb) ride a bicycle | Synonyms: bike, cycle, pedal, wheel |
| bicycler | (noun) a person who rides a bicycle | Synonyms: bicyclist, biker, cyclist, wheeler |
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| bicyclic | (adjective) having molecules consisting of two fused rings | - |
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| bicycling | (noun) riding a bicycle | - |
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| bicyclist | (noun) a person who rides a bicycle | Synonyms: bicycler, biker, cyclist, wheeler |
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| carbocyclic | (adjective) having or relating to or characterized by a ring composed of carbon atoms | - |
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| chlortetracycline | (noun) a yellow crystalline antibiotic (trade name Aureomycin) used to treat certain bacterial and rickettsial diseases | Synonyms: Aureomycin |
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| cyclamate | (noun) any salt or ester of cyclamic acid. | - |
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| cyclamen | (noun) Mediterranean plant widely cultivated as a houseplant for its showy dark green leaves splotched with silver and nodding white or pink to reddish flowers with reflexed petals | Synonyms: Cyclamen purpurascens |
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| cycle | (noun) a wheeled vehicle that has two wheels and is moved by foot pedals | Synonyms: bicycle, bike, wheel |
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| (noun) a single complete execution of a periodically repeated phenomenon | Synonyms: oscillation |
| (noun) a periodically repeated sequence of events | - |
| (noun) a series of poems or songs on the same theme | - |
| (noun) an interval during which a recurring sequence of events occurs | Synonyms: rhythm, round |
| (noun) the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz) | Synonyms: cps, cycle per second, cycles/second, hertz, Hz |
| (verb) recur in repeating sequences | - |
| (verb) ride a motorcycle | Synonyms: motorbike, motorcycle |
| (verb) ride a bicycle | Synonyms: bicycle, bike, pedal, wheel |
| (verb) pass through a cycle | - |
| (verb) cause to go through a recurring sequence | - |
| cyclic | (adjective) recurring in cycles | Synonyms: cyclical |
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| (adjective) of a compound having atoms arranged in a ring structure | - |
| (adjective) forming a whorl or having parts arranged in a whorl | - |
| (adjective) conforming to the Carnot cycle | - |
| (adjective) marked by repeated cycles | - |
| cyclical | (adjective) recurring in cycles | Synonyms: cyclic |
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| cyclicity | (noun) the quality of recurring at regular intervals | Synonyms: periodicity |
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| cycling | (noun) the sport of traveling on a bicycle or motorcycle | - |
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| cyclist | (noun) a person who rides a bicycle | Synonyms: bicycler, bicyclist, biker, wheeler |
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| cycloalkene | (noun) alkene hydrocarbon which contains a closed ring of carbon atoms, but has no aromatic character. | Synonyms: cycloolefin |
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| cyclobenzaprine | (noun) muscle relaxant (trade name Flexeril) used for muscle spasms or acute injury | Synonyms: Flexeril |
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| cyclohexanol | (noun) a colorless oily alcohol that smells like camphor | - |
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| cycloid | (adjective) resembling a circle | Synonyms: cycloidal |
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| (noun) a line generated by a point on a circle rolling along a straight line | - |
| cycloidal | (adjective) resembling a circle | Synonyms: cycloid |
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| cyclonal | (adjective) of or relating to or characteristic of a violent tropical storm | Synonyms: cyclonic, cyclonical |
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| (adjective) of or relating to or characteristic of the atmosphere around a low pressure center | Synonyms: cyclonic, cyclonical |
| cyclone | (noun) a violent rotating windstorm | - |
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| (noun) (meteorology) rapid inward circulation of air masses about a low pressure center; circling counterclockwise in the Northern Hemisphere and clockwise in the southern | - |
| cyclonic | (adjective) of or relating to or characteristic of a violent tropical storm | Synonyms: cyclonal, cyclonical |
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| (adjective) of or relating to or characteristic of the atmosphere around a low pressure center | Synonyms: cyclonal, cyclonical |
| cyclonical | (adjective) of or relating to or characteristic of a violent tropical storm | Synonyms: cyclonal, cyclonic |
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| (adjective) of or relating to or characteristic of the atmosphere around a low pressure center | Synonyms: cyclonal, cyclonic |
| cycloolefin | (noun) alkene hydrocarbon which contains a closed ring of carbon atoms, but has no aromatic character. | Synonyms: cycloalkene |
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| cyclooxygenase | (noun) either of two related enzymes that control the production of prostaglandins and are blocked by aspirin | Synonyms: Cox |
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| cyclopaedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopedia, encyclopaedia, encyclopedia |
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| cyclopean | (adjective) of or relating to or resembling the Cyclops | - |
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| cyclopedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopaedia, encyclopaedia, encyclopedia |
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| cyclopia | (noun) a developmental abnormality in which there is only one eye | - |
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| cyclopropane | (noun) a colorless flammable gas sometimes used as an inhalation anesthetic | - |
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| cyclops | (noun) minute free-swimming freshwater copepod having a large median eye and pear-shaped body and long antennae used in swimming; important in some food chains and as intermediate hosts of parasitic worms that affect man e.g. Guinea worms | Synonyms: water flea |
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| cyclorama | (noun) a picture (or series of pictures) representing a continuous scene | Synonyms: diorama, panorama |
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| cycloserine | (noun) an antibiotic that is especially active against the tubercle bacillus | - |
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| cyclosis | (noun) the circulation of cytoplasm within a cell | Synonyms: streaming |
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| cyclostome | (noun) primitive aquatic vertebrate | - |
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| cyclostyle | (noun) a writing implement with a small toothed wheel that cuts small holes in a stencil | - |
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| (verb) print with an implement with small toothed wheels that cuts small holes in a stencil | - |
| cyclothymia | (noun) a mild bipolar disorder that persists over a long time | Synonyms: cyclic disorder, cyclothymic disorder |
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| cyclothymic | (adjective) of or relating to or exhibiting cyclothymia | - |
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| cyclotron | (noun) an accelerator that imparts energies of several million electron-volts to rapidly moving particles | - |
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| doxycycline | (noun) an antibiotic derived from tetracycline that is effective against many infections | Synonyms: Vibramycin |
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| encyclical | (adjective) intended for wide distribution | - |
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| (noun) a letter from the pope sent to all Roman Catholic bishops throughout the world | Synonyms: encyclical letter |
| encyclopaedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopaedia, cyclopedia, encyclopedia |
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| encyclopaedic | (adjective) comprehensive in scope or content (as an encyclopedia) | Synonyms: encyclopedic |
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| encyclopaedism | (noun) profound scholarly knowledge | Synonyms: encyclopedism, eruditeness, erudition, learnedness, learning, scholarship |
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| encyclopaedist | (noun) a person who compiles information for encyclopedias | Synonyms: encyclopedist |
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| encyclopedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopaedia, cyclopedia, encyclopaedia |
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| encyclopedic | (adjective) comprehensive in scope or content (as an encyclopedia) | Synonyms: encyclopaedic |
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| encyclopedism | (noun) profound scholarly knowledge | Synonyms: encyclopaedism, eruditeness, erudition, learnedness, learning, scholarship |
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| encyclopedist | (noun) a person who compiles information for encyclopedias | Synonyms: encyclopaedist |
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| epicycle | (noun) a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid | - |
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| epicyclic | (adjective) of or relating to an epicycle | Synonyms: epicyclical |
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| epicyclical | (adjective) of or relating to an epicycle | Synonyms: epicyclic |
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| epicycloid | (noun) a line generated by a point on a circle rolling around another circle | - |
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| exercycle | (noun) an exercise device resembling a stationary bike | Synonyms: exercise bike |
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| gigacycle | (noun) 1,000,000,000 periods per second | Synonyms: Gc, GHz, gigacycle per second, gigahertz |
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| hemicycle | (noun) a plane figure with the shape of half a circle | Synonyms: semicircle |
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| heterocycle | (noun) a ring of atoms of more than one kind; especially a ring of carbon atoms containing at least one atom that is not carbon | Synonyms: heterocyclic ring |
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| (noun) a compound containing a heterocyclic ring | Synonyms: heterocyclic, heterocyclic compound |
| heterocyclic | (adjective) containing a closed ring of atoms of which at least one is not a carbon atom | - |
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| (noun) a compound containing a heterocyclic ring | Synonyms: heterocycle, heterocyclic compound |
| homocyclic | (adjective) containing a closed ring of atoms of the same kind especially carbon atoms | Synonyms: isocyclic |
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| hydroxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: oxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| hypocycloid | (noun) a line generated by a point on a circle that rolls around inside another circle | - |
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| iridocyclitis | (noun) inflammation of the iris and ciliary body of the eye | - |
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| isocyclic | (adjective) containing a closed ring of atoms of the same kind especially carbon atoms | Synonyms: homocyclic |
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| kilocycle | (noun) one thousand periods per second | Synonyms: kc, kHz, kilocycle per second, kilohertz |
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| megacycle | (noun) one million periods per second | Synonyms: Mc, megacycle per second, megahertz, MHz |
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| minocycline | (noun) tetracycline antibiotic (trade name Minocin) used to treat a variety of bacterial and rickettsial infections | Synonyms: Minocin |
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| monocycle | (noun) a vehicle with a single wheel that is driven by pedals | Synonyms: unicycle |
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| motorcycle | (noun) a motor vehicle with two wheels and a strong frame | Synonyms: bike |
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| (verb) ride a motorcycle | Synonyms: cycle, motorbike |
| motorcycling | (noun) riding a motorcycle | - |
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| motorcyclist | (noun) a traveler who rides a motorcycle | - |
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| noncyclic | (adjective) not cyclic | Synonyms: noncyclical |
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| (adjective) not having repeated cycles | - |
| noncyclical | (adjective) not cyclic | Synonyms: noncyclic |
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| nontricyclic | (noun) a class of antidepressant drugs that are not tricyclic drugs and do not act by inhibiting MAO | Synonyms: nontricyclic antidepressant, nontricyclic antidepressant drug, nontricyclic drug |
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| oxyphencyclimine | (noun) an anticholinergic drug (trade name Daricon) used in treating peptic ulcers | Synonyms: Daricon |
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| oxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: hydroxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| phencyclidine | (noun) a drug used as an anesthetic by veterinarians; illicitly taken (originally in the form of powder or `dust') for its effects as a hallucinogen | Synonyms: angel dust, PCP, phencyclidine hydrochloride |
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| procyclidine | (noun) drug (trade name Kemadrin) used to reduce tremors in Parkinsonism | Synonyms: Kemadrin |
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| recyclable | (adjective) capable of being used again | Synonyms: reclaimable, reusable |
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| recycle | (verb) use again after processing | Synonyms: reprocess, reuse |
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| (verb) cause to repeat a cycle | - |
| recycling | (noun) the act of processing used or abandoned materials for use in creating new products | - |
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| (noun) used or abandoned materials for use in creating new products | - |
| synchrocyclotron | (noun) cyclotron that achieves relativistic velocities by modulating the frequency of the accelerating electric field | - |
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| tetracycline | (noun) an antibiotic (trade name Achromycin) derived from microorganisms of the genus Streptomyces and used broadly to treat infections | Synonyms: Achromycin |
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| tricycle | (noun) a vehicle with three wheels that is moved by foot pedals | Synonyms: trike, velocipede |
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| tricyclic | (noun) an antidepressant drug that acts by blocking the reuptake of norepinephrine and serotonin and thus making more of those substances available to act on receptors in the brain | Synonyms: tricyclic antidepressant, tricyclic antidepressant drug |
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| unicycle | (noun) a vehicle with a single wheel that is driven by pedals | Synonyms: monocycle |
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| (verb) ride a unicycle | - |
| unicyclist | (noun) a person who rides a unicycle | - |
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| upcycle | (verb) To transform an old product into a newer and more expensive form with a different use | - |
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