Chemistry. a chemically inert gaseous element occurring in small amounts in the earth's atmosphere, used chiefly in a type of electrical lamp. Symbol: Ne; atomic weight: 20.183; atomic number: 10; density: 0.9002 g/l at 0°C and 760 mm pressure.
a sign or advertising sign formed from neon lamps.
using or containing the gas neon.
made of or formed by a neon lamp or lamps: a neon sign.