fifteener

fifteen +‎ -er

fifteener (plural fifteeners)

1. (UK, informal) A film assigned an age rating of 15, those under 15 not being permitted to view it.
   • 2009 January 24, Interviews by Becky Barnicoat, “Good to meet you: The Jackson children”, in The Guardian‎:

     Not intensely bloody decapitation, but the sort of violence you'd see in a fifteener.

2. (bibliography, informal) A book printed in the 15th century.
   • 1880, William Blades, The Enemies of Books, page 97:

     When here and there throughout those volumes you meet with titles of books now either unknown entirely or of the greatest rarity; when you find the Colophon from the end or the "insignum typographi" from the first leaf of a rare "fifteener" pasted down with dozens of others varying in value, you cannot bless the memory of the antiquarian shoemaker, John Bagford.

• Teneriffe