tab
1. The crescent-shaped tongue of leather extending
above and below the spine of some 12th century
bindings and probably intended to facilitate the
removal of the book from a chest where it was
stored spine uppermost. 2. A small square or
rectangular piece of paper, card, plastic,
leather, or fabric attached to the fore edge of a
leaf, and bearing one or more characters to serve
as a guide or INDEX . See also: TAB INDEX .
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