Real Dictionary

neon
Neon lights or signs are made from glass tubes filled with neon gas which produce a bright electric light.

neon in American English
an inert chemical element, one of the noble gases, that is tasteless, odorless, and colorless, found in small quantities in the earth's atmosphere and used in discharge tubes, gas lasers, bright electrical signs, etc.: symbol, Ne; at. no., 10
adjective: using or containing the gas neon
noun: a chemically inert gaseous element occurring in small amounts in the earth's atmosphere, used chiefly in a type of electrical lamp; at. wt.: 20.183; at. no.: 10; density: 0.9002 g/ l at 0°C and 760 mm pressure

neon in British English
noun: a colourless odourless rare gaseous element, an inert gas occurring in trace amounts in the atmosphere: used in illuminated signs and lights. Symbol: Ne; atomic no: 10; atomic wt: 20.1797; valency: 0; density: 0.899 90 kg/ m3; melting pt: –248.59° C; boil