Definition from Wiktionary, the free dictionary
bifold (not comparable)
bifold (plural bifolds)
- (carpentry) A door, window, shutter, or divider consisting of two equal panels hinged together so that it opens by folding the panels against each other.
- A sheet of paper or cardboard folded in half along a crease down the center.
- A wallet, billfold, or carrying case with a single fold, so that it opens like a book.
1998 July, Robert Frick, “What Your Wallet Says About You”, in Kiplinger's Personal Finance, volume 52, number 7, page 97:
- A 1996 survey showed that men under age 20 buy three times as many trifolds as bifolds. So a trifold wallet becomes a habit, even after it has expanded to the size and shape of a jumbo bar of soap.
- A crease or turn that causes something to double back on itself.
1898, George Manville Fenn, Jungle and Stream: Or, The Adventures of Two Boys in Siam, page 238:
- I want to learn how to play, and that's all puzzles and problems, and what do I care when I go to play a game about parallels and bifolds?
1928, Supreme Court Papers on Appeal from Order:
- ...in porous beds, which are known as reservoir beds, which are usually sandstones or porous limestones, trapped there usually, not always, under bifolds in the rocks or arches in the rocks known as anteclines, and nearly all oil, not all oil, but nearly all oil wells are found where such reservoir beds are drilled into on the top of such anteclines.