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Webster's English Dictionary

beam

n. [AS. bem beam, post, tree, ray of light; akin to OFries. bm tree, OS. bm, D. boom, OHG. boum, poum, G. baum, Icel. bamr, Goth. bagms and Gr. fy^ma a growth, fy^nai to become, to be. Cf. L. radius staff, rod, spoke of a wheel, beam or ray, and G. strahl arrow, spoke of a wheel, ray or beam, flash of lightning. 97. See Be; cf. Boom a spar.]1. Any large piece of timber or iron long in proportion to its thickness, and prepared for use. ()

2. One of the principal horizontal timbers of a building or ship. ()

The beams of a vessel are strong pieces of timber stretching across from side to side to support the decks. (Totten.)

3. The width of a vessel; as, one vessel is said to have more beam than another. ()

4. The bar of a balance, from the ends of which the scales are suspended. ()

The doubtful beam long nods from side to side. (Pope.)

5. The principal stem or horn of a stag or other deer, which bears the antlers, or branches. ()

6. The pole of a carriage. (Dryden.)

7. 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. ()

8. The straight part or shank of an anchor. ()

9. 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. ()

10. (Steam Engine) 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. ()

11. A ray or collection of parallel rays emitted from the sun or other luminous body; as, a beam of light, or of heat. ()

How far that little candle throws his beams! (Shak.)

12. A ray; a gleam; as, a beam of comfort. ()

Mercy with her genial beam. (Keble.)

13. One of the long feathers in the wing of a hawk; -- called also beam feather. ()

Abaft the beam (Naut.), in an arc of the horizon between a line that crosses the ship at right angles, or in the direction of her beams, and that point of the compass toward which her stern is directed. -- Beam center (Mach.), the fulcrum or pin on which the working beam of an engine vibrates. -- Beam compass, an instrument consisting of a rod or beam, having sliding sockets that carry steel or pencil points; -- used for drawing or describing large circles. -- Beam engine, a steam engine having a working beam to transmit power, in distinction from one which has its piston rod attached directly to the crank of the wheel shaft. -- Before the beam (Naut.), in an arc of the horizon included between a line that crosses the ship at right angles and that point of the compass toward which the ship steers. -- On the beam, in a line with the beams, or at right angles with the keel. -- On the weather beam, on the side of a ship which faces the wind. -- To be on her beam ends, to incline, as a vessel, so much on one side that her beams approach a vertical position. ()

v. t. To send forth; to emit; -- followed ordinarily by forth; as, to beam forth light. ()

v. i. To emit beams of light. ()

He beamed, the daystar of the rising age. (Trumbull.)