S: (n) beeper, pager (an electronic device that generates a series of beeps when the person carrying it is being paged)
S: (n) defibrillator (an electronic device that administers an electric shock of preset voltage to the heart through the chest wall in an attempt to restore the normal rhythm of the heart during ventricular fibrillation)
S: (n) liquid crystal display, LCD (a digital display that uses liquid crystal cells that change reflectivity in an applied electric field; used for portable computer displays and watches etc.)
S: (n) active matrix screen (a type of LCD screen used for some portable computers; there is a separate circuit for each pixel)
S: (n) passive matrix display (a type of LCD display used for some portable computers; parallel wires run both vertically and horizontally and pixels are turned on when the wires intersecting at that pixel are both energized) "passive matrix displays are generally inferior to active matrix displays"
S: (n) dual scan display (a type of passive matrix display in which the top and bottom half of the screen are refreshed simultaneously)
S: (n) window ((computer science) a rectangular part of a computer screen that contains a display different from the rest of the screen)
S: (n) dialog box, panel ((computer science) a small temporary window in a graphical user interface that appears in order to request information from the user; after the information has been provided the user dismisses the box with `okay' or `cancel')
S: (n) foreground ((computer science) a window for an active application)
S: (n) dongle ((computer science) an electronic device that must be attached to a computer in order for it to use protected software)
S: (n) doubler (an electronic device that doubles the voltage or the frequency of an input signal)
S: (n) generator (an electronic device for producing a signal voltage)
S: (n) oscillator (generator that produces sonic oscillations or alternating current)
S: (n) crystal oscillator, quartz oscillator (an oscillator that produces electrical oscillations at a frequency determined by the physical characteristics of a piezoelectric quartz crystal)
S: (n) mouse, computer mouse (a hand-operated electronic device that controls the coordinates of a cursor on your computer screen as you move it around on a pad; on the bottom of the device is a ball that rolls on the surface of the pad) "a mouse takes much more room than a trackball"
S: (n) multiplexer (a device that can interleave two or more activities)
S: (n) data multiplexer (a multiplexer that permits two or more data sources to share a common transmission medium)
S: (n) readout, read-out (an electronic device the displays information in a visual form)
S: (n) repeater ((electronics) electronic device that amplifies a signal before transmitting it again) "repeaters can be used in computer networks to extend cabling distances"
S: (n) system clock (an electronic device in a computer that issues a steady high-frequency signal that synchronizes all the internal components)
S: (n) trackball (an electronic device consisting of a rotatable ball in a housing; used to position the cursor and move images on a computer screen) "a trackball is essentially an upside-down mouse"
S: (n) cathode-ray tube, CRT (a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen)
S: (n) glow lamp (a gas-discharge tube with a hot cathode; used in stroboscopes)
S: (n) glow tube (a gas-discharge tube consisting of a cold cathode and a diode in a tube filled with gas; the color of the glow depends on the particular gas)
S: (n) klystron (an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation)
S: (n) magnetron (a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators)
S: (n) pentode (a thermionic tube having five electrodes)
S: (n) iconoscope (the first practical television-camera for picture pickup; invented in 1923 by Vladimir Kosma Zworykin)
S: (n) orthicon, image orthicon (a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons)
S: (n) tetrode (a thermionic tube having four electrodes)
S: (n) triode (a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible)
S: (n) X-ray tube (a vacuum tube containing a metal target onto which a beam of electrons is directed at high energy for the generation of X rays)