fanfold

noun

1. 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.

adjective

2. (of a pad or tablet of invoices, bills, blank sheets, etc.) made up in such a form.
3. pertaining to continuous-form paper, folded like a fan or accordion so that it will stack.