The Collaborative International Dictionary of English v.0.48:

Stopple \Stop"ple\, v. t. [imp. & p. p. Stoppled; p. pr. & vb.
   n. Stoppling.]
   To close the mouth of anything with a stopple, or as with a
   stopple. --Cowper.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Stopple \Stop"ple\, n. [Cf. G. st["o]pfel, st["o]psel. See
   Stop, n. & v. t.]
   That which stops or closes the mouth of a vessel; a stopper;
   as, a glass stopple; a cork stopple.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stopple
    n 1: blockage consisting of an object designed to fill a hole
         tightly [syn: plug, stopper, stopple]
    v 1: close or secure with or as if with a stopper; "She
         stoppered the wine bottle"; "The mothers stoppered their
         babies' mouths with pacifiers" [syn: stopper, stopple]