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In this Adventure in Etymology we discover what links the word beam with words for tree.
Meanings of beam [ˈbiːm] include any large piece of timber or iron long in proportion to its thickness, and prepared for use; one of the transverse members of a ship’s frame on which the decks are laid; a ray or collection of approximately parallel rays emitted from the sun or other luminous body.
It comes from Middle English be(e)m [bɛ̝ːm] (beam, pole, antler, tree), from Old English bēam [bæɑːm] (tree, beam, gallows), from Proto-West Germanic *baum (tree, beam), from Proto-Germanic *bagmaz (tree, beam), possibly from PIE *bʰuH- (to become, grow, appear) [source].
Words from the same Proto-Germanic roots include Baum (tree, boom) and beamen (to beam, teleport, project) in German (borrowed from English, popularised by Star Trek), bom (bar, barrier, beam) in Danish, boom (tree, beam, mast) in Dutch, puomi (boom, barrier, pole) in Finnish, boom in English [source].
Incidentally, in Middle English there were several words for tree, including tre (tree, plants, wood), bem (beam, a set of scales, antler, tree) and arbre (tree). The first two come from Old English and Proto-Germanic, while arbre comes from Old French arbre (tree).
Related words in English include arboretum (a place where many varieties of tree are grown for research, educational, and ornamental purposes), arboreal (tree-like, relating to trees) [source].
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I also write about words, etymology and other language-related topics on the Omniglot Blog, and I explore etymological connections between Celtic languages on the Celtiadur blog.












