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.
German inventor Paul Nipkow developed a rotating-disc technology to transmit pictures over wire in 1884 called the Nipkow disk. Nipkow is credited with discovering television's scanning principle, in which the light intensities of small portions of an image are successively analyzed and transmitted.