Inward; interior; being within any limit or surface; inclosed; -- opposed to external; as, the internal parts of a body, or of the earth.
adjective, Latin internus = inward, hence, nearer the inside.
filters Any filter operated inside the fish tank. under gravel filters and sponge filters are two examples of these.
Combustion Engine An engine in which both the heat energy and the ensuing mechanical energy are produced inside the engine. Includes gas turbines, spark ignition gas, and compression ignition diesel engines.
inside the country; "the British Home Office has broader responsibilities than the United States Department of the Interior"; "the nation's internal politics"
located inward; "Beethoven's manuscript looks like a bloody record of a tremendous inner battle"- Leonard Bernstein; "she thinks she has no soul, no interior life, but the truth is that she has no access to it"- David Denby; "an internal sense of rightousness"- A.R.Gurney,Jr.
the location of illnesses such as those that affect qi, blood, and organs inside the body
(L. internus, interior). Deep or away from the surface.
A device that is installed inside a computer's case. See also External.
pertaining to the inside of the frog