crystal pickup: a cartridge in which an output voltage is produced by the vibration of a piezoelectric crystal
instrumentality: an artifact (or system of artifacts) that is instrumental in accomplishing some end
infectious mononucleosis: an acute disease characterized by fever and swollen lymph nodes and an abnormal increase of mononuclear leucocytes or monocytes in the bloodstream; not highly contagious; some believe it can be transmitted by kissing