Source : Webster's Revised Unabridged Dictionary (1913)

Interleaf \In"ter*leaf`\, n.; pl. {Interleaves}. [See
   {Interleave}.]
   A leaf inserted between other leaves; a blank leaf inserted,
   as in a book.

Source : WordNet®

interleaves
     See {interleaf}

interleaf
     n : a blank leaf inserted between the leaves of a book
     [also: {interleaves} (pl)]