helion

== English == === Etymology 1 === From helium +‎ -on. ==== Noun ==== helion (plural helions) (physics, sometimes) Any helium ion, the nucleus of any helium atom. Hypernyms: ion < particle Hyponyms: helion (narrow sense), alpha particle (physics, usually) A helium-3 ion, the nucleus of a helium-3 atom. Formula: 3He+2. Alternative form: h (symbol) Antonym: antihelion Hypernyms: helion (broad sense) < ion < particle Coordinate terms: alpha particle (helium-4 nucleus); proton (hydrogen-1 nucleus), deuteron (hydrogen-2 nucleus), triton (hydrogen-3 nucleus) ===== Derived terms ===== ===== Translations ===== === Etymology 2 === ==== Noun ==== helion (plural helions) (astronomy) A meteoroid that arrives from the approximate direction of the Sun. == Romanian == === Etymology === Borrowed from French hélion. === Noun === helion m (plural helioni) helion ==== Declension ====