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battering ram a heavy beam once used in war to break through doors, walls, or gates.
colonnade a series of columns that holds up a roof or beam.
derrick a machine for lifting and moving heavy loads. It has a center beam that does not move and a long arm that turns around the base. [1/2 definitions]
floodlight an electric lamp that shines a bright beam of light over a wide area.
girder a heavy beam made of steel or wood used to support the floor or framework of a bridge or building.
gleam a small or brief flash or beam of light. [2/3 definitions]
laser a device that makes a strong, narrow beam of light by stimulating the atoms in a gas or crystal.
projector a machine for projecting an image onto a screen by casting a beam of light through photographic film.
ray1 a thin beam of light or some other radiation. [1/3 definitions]
searchlight a lamp that can direct a powerful beam of light in any direction.
shaft a straight beam or ray. [1/6 definitions]
x-ray a beam of high-energy radiation that is able to pass through many kinds of solid material. [2/3 definitions]