The Collaborative International Dictionary of English v.0.48:

Drumhead \Drum"head`\, n.
   1. The parchment or skin stretched over one end of a drum.
      [1913 Webster]

   2. The top of a capstan which is pierced with sockets for
      levers used in turning it. See Illust. of Capstan.
      [1913 Webster]

   Drumhead court-martial (Mil.), a summary court-martial
      called to try offenses on the battlefield or the line of
      march, when, sometimes, a drumhead has to do service as a
      writing table.
      [1913 Webster]

WordNet (r) 3.0 (2006):

drumhead
    adj 1: performed speedily and without formality; "a summary
           execution"; "summary justice" [syn: drumhead,
           summary]
    n 1: a membrane that is stretched taut over a drum [syn:
         drumhead, head]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "drumhead":
   bender, bloat, blotter, booze, boozehound, boozer, brannigan, bust,
   drunk, guzzler, inebriate, jag, lush, soak, sot, souse, spree,
   tear, tippler