designed to help correct or ameliorate the discomfort of disorders of the spine and joints: orthopaedic mattresses Collins English Dictionary - Complete & Unabridged 2012 Digital Edition Â© William Collins Sons & Co. Ltd. 1979, 1986 Â© HarperCollins
Definition of Immelmann. : a maneuver in which an airplane reverses direction by executing half of a loop upwards followed by half of a roll âcalled also Immelmann turn.
Parallel Immobilization Technique. All three terms mean the same thing, a bumping technique used by U.S. police departments during car pursuits to force the pursued vehicle to abruptly turn sideways to the direction of travel, causing the driver to lose control and stop. Usually used in the phrase PIT maneuver.