cycloaddition

Etymology tree
Proto-Indo-European *kʷel-
Proto-Indo-European *kʷékʷlos
Ancient Greek κῠ́κλος (kŭ́klos)der.
Late Latin cyclusbor.
Middle English cicle
English cycle
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Ancient Greek κύκλος (kúklos)
Proto-Indo-European *-kos
Ancient Greek -κός (-kós)
Ancient Greek -ικός (-ikós)
Ancient Greek κυκλῐκός (kuklĭkós)bor.
Classical Latin cyclicuslbor.
Middle French cyclique
French cycliquebor.
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Classical Latin cyclicusbor.
English cyclic
English cyclo-
Proto-Indo-European *h₂éd
Proto-Italic *ad
Proto-Italic *ad-
Latin ad-
Proto-Indo-European *dʰeh₁-
Proto-Indo-European *dʰéh₁tder.
Proto-Italic *-ðō
Latin -dō
Latin addō
Latin additiōder.
Old French aditionder.
Middle English addicioun
English addition
English cycloaddition
From cyclo- + addition.