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.
a maneuver in which an airplane makes a half loop, then resumes its normal, level position by making a half roll: used to gain altitude while turning to fly in the opposite direction. Also called Immelmann turn. Origin of Immelmann. 1915-1920.