Meaning

noun a signal transmitted along a narrow path; guides airplane pilots in darkness or bad weather

verb smile radiantly; express joy through one's facial expression

noun long thick piece of wood or metal or concrete, etc., used in construction

originFrom Middle English beem, from Old English bēam (“tree, cross, gallows, column, pillar, wood, beam, splint, post, stock, rafter, piece of wood”), from Proto-West Germanic *baum, from Proto-Germanic *baumaz (“tree, beam, balk”), from Proto-Indo-European *bʰew- (“to grow, swell”).…

Etymology from Wiktionary, CC BY-SA 3.0