fan•foldPronunciation: (fan'fōld"), [key]
a pad or tablet of invoices, bills, blank sheets, etc., interleaved with carbon paper for making a copy or copies of the writing or typing on the uppermost leaf.
(of a pad or tablet of invoices, bills, blank sheets, etc.) made up in such a form.
pertaining to continuous-form paper, folded like a fan or accordion so that it will stack.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.