Preferred label: 

Areas of a page between the printed, written, or illustrative matter (text area) and the edges of the leaf. The four margins are usually called the 'head' (or top); 'fore-edge' (or outer, outside, side); 'tail' (or bottom foot); and 'inner' (or gutter).

Etherington & Roberts (1982)

Roberts, Matt, Don Etherington, and Margaret R. Brown. 1982. Bookbinding and the conservation of books: a dictionary of descriptive terminology. Washington: Library of Congress.

Additional reference: (modified)
Broader concept: 
Broader partitive concept: 
Top concept: 
Getty AAT: