A variant or archaic spelling of 'buffet'; a sideboard or display table for food; or possibly a medieval furniture piece.
From Old French 'buffet' (a small bench, cupboard, or food service table); the 'beau-' prefix might indicate a fine or decorative version, or be a corruption.
If this is a real word, it's extremely rare—but it shows how 'buffet' and other French furniture terms came into English differently in various regions and centuries, creating spelling variants that eventually standardized.
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