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architrave in architecture, the lowermost beam resting directly on supporting columns. [1/2 definitions]
balance beam a long wooden horizontal beam raised about four feet above the floor, on which women gymnasts perform various balancing routines. [1/2 definitions]
balk a heavy beam or timber used in building construction. [1/7 definitions]
battering ram a heavy wooden beam used by warriors in former times to break through doors, walls, gates, or the like. [2 definitions]
boom2 a heavy beam on a derrick, used to extend and support cargo or other weight. [1/5 definitions]
brace something that supports or steadies, such as a beam in the framework of a building. [1/10 definitions]
bright (pl.) the high beam of automotive vehicle headlights. (Cf. dim.) [1/7 definitions]
bumpkin2 a pole or beam protruding from a ship's deck or hull used to tie down blocks and the like or to extend sails.
cathead a beam projecting from the bow of a ship, to which the anchor is hoisted and secured.
cathode-ray tube a vacuum tube in which a stream of electrons is accelerated and focused in a beam that produces lighted traces on a screen at one end of the tube, used in television sets, computer monitors, and the like.
collider in nuclear physics, a type of accelerator in which occurs the bombardment of certain charged particles by certain others, such as electrons and positrons; colliding-beam machine.
collimator a device that transmits a beam of radiation, esp. light, as parallel rays. [1/2 definitions]
crossbeam a beam that reaches from one side to the other in a structure.
crosstie a transverse timber or rod used to support a longitudinal beam or rail. [1/2 definitions]
CRT abbreviation of "cathode-ray tube," a vacuum tube in which a stream of electrons is accelerated and focused in a beam that produces lighted traces on a screen at one end of the tube, used in television sets, computer monitors, and the like.
dimmer (usu. pl.) the parking lights or low-beam headlights of a vehicle. [1/2 definitions]
electron lens an electric or magnetic field, or a combination of the two, that is used to focus or deflect an electron beam.
flitch any of two or more planks bolted together to form a beam. [1/4 definitions]
floodlight an electric lamp that casts a strong beam of light over a wide area. [1/3 definitions]
Fresnel mirrors two mirrors joined together at an angle slightly less than 180 degrees, so that a beam of light falling on them is reflected in different directions, producing interference fringes where the reflected light overlaps.
gibbet a structure built for execution by hanging and for the public exhibition of those hanged, consisting of a vertical post to which a horizontal beam is attached at the top; gallows. [1/2 definitions]