'Foolscap' definitions:

Definition of 'foolscap'

From: WordNet
noun
A size of paper used especially in Britain

Definition of 'Foolscap'

From: GCIDE
  • Foolscap \Fools"cap`\, n. [So called from the watermark of a fool's cap and bells used by old paper makers. See Fool's cap, under Fool.] A writing paper made in sheets, ordinarily 16 x 13 inches, and folded so as to make a page 13 x 8 inches. See Paper. [1913 Webster]