The word 'wood' descends directly from the Old English 'wudu' or 'widu', meaning "tree, trees collectively, forest, grove; the substance of which trees are made." This Old English term traces back to the Proto-Germanic 'widuz-', a word of uncertain deeper origin, though it may be connected to the Celtic 'vidu-', also meaning wood. The semantic journey is remarkably stable, with the core meanings of "the material from trees" and "a collection of trees" preserved from its earliest Germanic roots into modern English. Its enduring simplicity reflects its fundamental role in the material and natural landscape of early Germanic-speaking peoples.

This is a simplex word of Old English origin. It functions as a base noun.