Argon (noun)

A chemical element with the symbol Ar and atomic number 18. It is a colorless, odorless, inert monatomic gas that forms about 0.93% of the Earth's atmosphere.

Origin:

From the greek word "argos" meaning inactive or lazy.

Examples:

1. The welding torch used a mixture of argon and oxygen to create a stable flame.
2. The balloons filled with argon made them more buoyant than helium.
3. Argon is used in incandescent lamps to create a gas that is less reactive than air.
4. The argon gas used in the experiment was purified to remove impurities.
5. The argon is used as a shield gas in the process of welding and cutting metal.