helium hydride

== English == === Noun === helium hydride (uncountable) (inorganic chemistry) Ellipsis of helium hydride cation, the unstable binary cation HeH+ present in interstellar space; it is the strongest acid, reactive with every chemical species except positive ions, including electrons. ==== Synonyms ==== ==== Hypernyms ==== acid cation ion superacid ==== Translations ====