Meaning

noun a colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts

originLearned borrowing from Ancient Greek νέον (néon), neuter of νέος (néos, “new”), from earlier *νέϝος (*néwos), from Proto-Hellenic *newos, from Proto-Indo-European *néwos. By surface analysis, neo- + -on (suffix used in all noble gases).

Etymology from Wiktionary, CC BY-SA 3.0