Dictionary![]() ![]() cy•clo•ad•di•tionPronunciation: (sī"klō-u-dish'un, sik"lō-), [key] —n. Chem. 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.
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