An ornamental or decorative facing on the front of a building or object; an alternative spelling of frontispiece.
From front + piece, directly combining English words to create a compound meaning 'piece at the front.' This is an older or variant spelling of frontispiece.
You'll sometimes see old texts and architectural descriptions use 'frontpiece' as an older spelling of 'frontispiece'—it's a great example of how English spelling wasn't standardized until relatively recently!
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