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cycloaddition

[sahy-kloh-uh-dish-uh n, sik-loh-]
noun Chemistry.
  1. the formation of a cyclic compound by the addition reaction of unsaturated molecules.
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Origin of cycloaddition

First recorded in 1960–65; cyclo- + addition
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018