See Also: cyclo-(medicine)
cyclo-(dictionary)

cyclo- (iou)



cyclo- combining form.
[from Greek kuklos circle, or directly from CYCLE noun, CYCLIC: see -O-.]
1. Forming nouns and adjectives with the sense 'circular, cyclic, of circles or cycles'.
2. Chemistry. Prefixed to names of hydrocarbons to form names of cyclic hydrocarbons with rings of corresponding numbers of carbon atoms (as cyclobutane, cyclopentadiene, cyclopentane, etc.), or used more generally with the sense 'involving cyclic compounds'.
3. With the sense 'of bicycles or cycling'.
cyclo-a'ddition noun an addition reaction in which a cyclic molecule is formed M20.
cyclo'alkane noun (Chemistry) = cycloparaffin M20.
cyclo-cross noun cross-country racing on bicycles M20.
cyclo'dextrin noun (Chemistry) a compound whose molecule is a ring of six to eight cyclic hexoses linked end to end M20.
cyclodi'alysis noun, pl. -lyses , Medicine an operation for relieving glaucoma by surgically detaching the ciliary body of the eye from the sclera E20.
cyclogiro noun, pl. -os, a rotor aircraft obtaining lift from aerofoils rotating about a horizontal axis M20.
cyclograph noun an instrument for tracing circular arcs E19.
cyclo'hexane noun a colourless liquid cycloparaffin, C6H12, obtained in petroleum or by hydrogenating benzene, and widely used as a solvent L19.
cyclomor'phosis noun, pl. -phoses , (Biology) a seasonal change in form undergone by some planktonic organisms E20.
cyclo'paraffin noun any saturated cyclic hydrocarbon E20.
cyclo'phosphamide noun [from PHOSPH- + AMIDE] Pharmacology a white crystalline synthetic compound, C7H15Cl2N2O2P, used as a cytotoxic drug in the treatment of tumours and some kinds of leukaemia M20.
cyclo'plegia noun (Medicine) paralysis of the ciliary muscle of the eye E20.
cyclo'plegic adjective & noun (a) adjective pertaining to or producing cycloplegia; (b) noun a substance that produces cycloplegia: E20.
cyclo'propane noun (Chemistry) a flammable gaseous hydrocarbon, C3H6, used chiefly as an anaesthetic M20.
cyclo'rrhaphous adjective [Greek rhaphe seam] Entomology of or pertaining to the very large suborder Cyclorrhapha of dipteran insects characterized by the emergence of the adult from the puparium through a circular split L19.
cyclo'sporin noun [mod. Latin polysporum (see below) + -IN1] (more fully
cyclosporin A) a cyclic oligopeptide produced by the fungus Trichoderma polysporum and used as an immunosuppressive drug to prevent the rejection of grafts and transplants L20.
cyclostrophic adjective (Meteorology) designating the force acting on a wind as a consequence of the curvature of its path; (of a wind) dominated by such forces: E20.
cyclothem noun [Greek thema something laid down, THEME] Geology a sedimentary deposit whose structure shows evidence of a cyclic process of deposition M20.