any large piece of timber or iron long in proportion to its thickness, and prepared for use.-one of the principal horizontal timbers of a building or ship.-the width of a vessel; as, one vessel is said to have more beam than another.-the bar of a balance, from the ends of which the scales are suspended.-the principal stem or horn of a stag or other deer, which bears the antlers, or branches.-the pole of a carriage.-a cylinder of wood, making part of a loom, on which weavers wind the warp before weaving; also, the cylinder on which the cloth is rolled, as it is woven; one being called the fore beam, the other the back beam.-the straight part or shank of an anchor.-the main part of a plow, to which the handles and colter are secured, and to the end of which are attached the oxen or horses that draw it.-a heavy iron lever having an oscillating motion on a central axis, one end of which is connected with the piston rod from which it receives motion, and the other with the crank of the wheel shaft; -- called also working beam or walking beam.-a ray or collection of parallel rays emitted from the sun or other luminous body; as, a beam of light, or of heat.-fig.: a ray; a gleam; as, a beam of comfort.-one of the long feathers in the wing of a hawk; -- called also beam feather.-to send forth; to emit; -- followed ordinarily by forth; as, to beam forth light.-to emit beams of light.