tetracyclo

Etymology tree
Proto-Indo-European *kʷetwóres
Proto-Hellenic *kʷétwores
Ancient Greek τέσσᾰρες (téssăres)
Ancient Greek τετρᾰ- (tetră-)bor.
English tetra-
Proto-Indo-European *kʷel-
Proto-Indo-European *kʷékʷlos
Ancient Greek κῠ́κλος (kŭ́klos)der.
Late Latin cyclusbor.
Middle English cicle
English cycle
Ancient Greek κυκλῐκός (kuklĭkós)bor.
Classical Latin cyclicuslbor.
Middle French cyclique
French cycliquebor.
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Classical Latin cyclicusbor.
English cyclic
English cyclo-
English tetracyclo
From tetra- + cyclo-.