Definition of beaker for Students. : a cup or glass with a wide mouth and usually a lip for pouring that is used especially in science laboratories for holding and measuring liquids.
In Microsoft Windows, each environment variable's default value is stored in the Windows registry or set in the AUTOEXEC.BAT file. On Unix, a setuid program is given an environment chosen by its caller, but it runs with different authority from its caller.
(See the discussion on this page .) However, the term variable is normally reserved in command line usage for entities that are declared as environment variables with the set command. Note that this is a pretty primitive way to define variables.