Source : Webster's Revised Unabridged Dictionary (1913)

Tankard \Tank"ard\, n. [OF. tanquart; cf. OD. tanckaert; of
   uncertain origin.]
   A large drinking vessel, especially one with a cover.

         Marius was the first who drank out of a silver tankard,
         after the manner of Bacchus.             --Arbuthnot.

Source : WordNet®

tankard
     n : large drinking vessel with one handle