- ethanolA simple aliphatic alcohol formally derived from ethane by replacing one hydrogen atom with a hydroxyl group: CH₃-CH₂-OH.
- etherThe medium breathed by human beings; the air.
- aetherOne of the Greek primordial deities who was the personification of light, brother-husband of Hemera and grandson of Chaos.
- aethrioscopeA device for measuring temperature variations due to different atmospheric conditions, such as cloud or clear skies.
- eth-Used as a combining form to denote the presence of 2 carbon atoms in the parent chain when forming names of organic compounds.