noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Any helium ion, the nucleus of any helium atom. sometimes
2. 2
   A meteoroid that arrives from the approximate direction of the Sun.
3. 3
   Any helium ion, the nucleus of any helium atom.; A helium-3 ion, the nucleus of a helium-3 atom. Formula: ³He⁺². sometimes, usually

Antonyms

All antonyms

antihelion

Etymology

From helium + -on.

Related phrases

alpha particlehelium 3

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.