cyclo- • comb. form 1. circular: cyclorama.2. relating to a cycle or cycling: cyclocross.3. cyclic: cycloparaffin.

cyclo- comb. form of Gr. kūklos CYCLE, in: (i) scientific terms denoting circular or coiled forms or parts, e.g. cyclostomatous, cyclostomous having a round sucking mouth, as the lamprey, (ii) names of inventions having circular parts of concerned with circles, e.g. cyclometer instrument for measuring arcs, apparatus for registering distance travelled by a vehicle. XIX.