cyclobutene

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 *gʷṓws
Proto-Hellenic *gʷous
Ancient Greek βοῦς (boûs)
Proto-Indo-European *tewh₂-
Proto-Indo-European *-rós
Proto-Indo-European *tuh₂rós
Proto-Hellenic *tūrós
Ancient Greek τῡρός (tūrós)
Ancient Greek βούτῡρος (boútūros)der.
English but-
English -ene
English butene
English cyclobutene
From cyclo- + butene.