A company founded in 1953 by Cave Johnson, originally to create shower curtains for the U.S. Military, but went in a different direction after Johnson went insane from mercury poisoning. Most notable works include the Aperture Science Handheld Portal Device, and the supercomputer GLaDOS. Considered a rival to Black Mesa.
Noun. A pet name for a silly person. A shortening of daft apeth. Apeth, derived from haypneeworth (half a penny's worth) but pronounced ha'p'orth. (British)