Simple Definition:

Ether is a type of organic compound [a substance made up of carbon and hydrogen atoms] that is commonly used as a solvent [a liquid that dissolves other substances] in chemistry. It has a unique molecular structure consisting of two carbon atoms bonded to an oxygen atom, with other atoms or groups of atoms attached to the carbon atoms. Ethers are often used in laboratory experiments and industrial processes to dissolve and separate different chemicals.

For example:

• Diethyl ether, a common type of ether, is used as a solvent for various reactions in organic synthesis [the production of complex compounds from simpler ones].
• An ether solution can be used to extract a desired compound from a mixture by dissolving it and leaving behind unwanted substances.

Very Simple Definition:

Ether is a special liquid that helps chemists do their experiments. It can mix with different things and dissolve them.