ethanol
grain alcohol
[U] Uncountable
This term is primarily used in scientific, industrial, and regulatory contexts to specify the chemical compound ethyl alcohol. While "alcohol" is a broad category of organic compounds or a casual term for spirits, ethanol specifically identifies the molecule used in fuel and medical disinfectants, carrying a clinical and precise connotation.
As a mass noun, ethanol is uncountable. It does not have a plural form in standard usage; instead, quantities are specified using units of measurement or partitive phrases such as "a volume of ethanol" or "a sample of ethanol."
Used to describe the chemical substance as a mass, such as in a laboratory beaker or a fuel tank.