noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A stable isotope ¹⁹⁷₇₉Au, having 79 protons and 118 neutrons; it is the only stable isotope of gold, and the only isotope of gold that occurs in nature in significant amounts. uncountable

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