gaz rarecommon nounEtymologyexpandsee gas and rare. use since the beginning of the 20th century after their discovery at the very end of the 19th century.Definition1. Chemical element that is very unreactive, belonging to group 18 of the periodic table of elements, in gaseous form under normal temperature and pressure conditions.chimieexpandLa question de savoir quelle place il fallait assigner aux gaz rares dans le système périodique a été résolue par Ramsay lui-même.Synonymsgaz inertegaz nobleHyponymshéliumnéonargonkryptonxénonradonununoctium