A front door or an entrance door at the fore or front of a building.
From 'fore-' (front) + 'door.' This is a straightforward compound word combining two common English terms to specify which door is meant.
Old English had many 'fore-' compound words for body parts and building features—'foredoor,' 'foreleg,' 'forehead'—because people needed precise language before they had words like 'anterior' or 'front.'
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