thumbhole
A semi-circular or triangular cut in the sides of
a slipcase designed to facilitate removal of the
enclosed book. The semi-circular cut is used in
the best work, while the triangular cut, which is
used principally by library and edition binders in
the United States, is much more economical,
especially since it is usually made after the case
has been covered.
![[CoOL]](/icons/sm_cool.gif){kind=icon}