Source : Webster's Revised Unabridged Dictionary (1913)

Shawm \Shawm\, n. [OE. shalmie, OF. chalemie; cf. F. chalumeau
   shawm, chaume haulm, stalk; all fr. L. calamus a reed, reed
   pipe. See {Haulm}, and cf. {Calumet}.] (Mus.)
   A wind instrument of music, formerly in use, supposed to have
   resembled either the clarinet or the hautboy in form.
   [Written also {shalm}, {shaum}.] --Otway.

         Even from the shrillest shaum unto the cornamute.
                                                  --Drayton.

Source : WordNet®

shawm
     n : a medieval oboe