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Meaning of cycloaddition

cy•clo•ad•di•tion

Pronunciation: (sī"klō-u-dish'un, sik"lō-), [key]
— n. Chem.
  1. the formation of a cyclic compound by the addition reaction of unsaturated molecules.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.