ETYM AS. beám beam, post, tree, ray of light; akin to OFries. bâm tree, OS. bôm, Dutch boom, Old High Germ. boum, poum, German baum, Icel. bathmr, Goth. bagms and Greek phyma a growth, phynai to become, to be.
1. A column of light (as from a beacon); SYN. beam of light, light beam, ray, ray of light, shaft, shaft of light.
2. A group of nearly parallel lines of electromagnetic radiation.
3. Breadth amidships.
4. Long thick piece of wood or metal or concrete, etc., used in construction.
A configuration of radiated energy characterized by rays that are sharply directional and parallel.