pocket pock·et (pŏk'ĭt)
In anatomy, a cul-de-sac or pouchlike cavity.
A diseased space between the inflamed gum and the surface of a tooth.
A collection of pus in a nearly closed sac.
To enclose within a confined space.
To approach the surface at a localized spot, as with the thinned out wall of an abscess which is about to rupture.