Home › Words › O › octaoxygenoctaoxygenoctaoxygen · noun — A red allotrope of oxygen, O₈, that is stable only under very high pressures.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom octa- + oxygen.nounA red allotrope of oxygen, O₈, that is stable only under very high pressuresDefinitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.octaoxo 76% match — A chemical compound with eight oxygen atoms with double bonds. vs octaoxygen →tetraoxygen 74% match — an allotrope of oxygen having four atoms in each molecule instead of the normal two; only stable under very high pressures vs octaoxygen →octoxide 70% match — any oxide having eight oxygen atoms in each molecule or unit cell vs octaoxygen →pentaoxolane 69% match — The unstable allotrope of oxygen (O₅) composed of a ring of five atoms vs octaoxygen →hexaoxane 66% match — The unstable allotrope of oxygen (O₆) composed of a ring of six atoms vs octaoxygen →oxozone 66% match — tetraoxygen vs octaoxygen →octasulfur 63% match — The most common allotrope of sulfur (S₈), containing eight atoms in a ring. vs octaoxygen →octacopper 62% match — Eight atoms of copper in a chemical compound. vs octaoxygen →