October 2006, V5 #10: Define Friday, Mar 20 2009 

Tail: The bottom edge of a leaf, board, or bound volume; that is, the surface on which a volume rests when shelved upright.

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For other printing, publishing, marketing lingo, check our glossary at http://www.gregathcompany.com/gloss.html

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June 2006, V5#6: Define Friday, Jan 30 2009 

Trim Edge (or Margin – also “Fore Edge”): The edge of the page (leaf) or a board opposite from but parallel to, its binding edge (i.e., opposite from its binding edge).