The Collaborative International Dictionary of English v.0.48:

Ottoman \Ot"to*man\, n.; pl. Ottomans.
   1. A Turk.
      [1913 Webster]

   2. [F. ottomane, from ottoman Turkish.] A stuffed seat
      without a back, originally used in Turkey.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ottoman \Ot"to*man\, a. [F. ottoman: cf. It. ottomano,
   ottomanno; -- from Othoman, Othman, or Osman, the name of a
   sultan who assumed the government of Turkey about the year
   1300. Cf. Osmanli, Ottoman a stuffed seat.]
   Of or pertaining to the Turks; as, the Ottoman power or
   empire.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Ottoman
    adj 1: of or relating to the Ottoman Empire or its people or its
           culture
    n 1: a Turk (especially a Turk who is a member of the tribe of
         Osman I) [syn: Ottoman, Ottoman Turk, Osmanli]
    2: the Turkish dynasty that ruled the Ottoman Empire from the
       13th century to its dissolution after World War I [syn:
       Ottoman, Ottoman dynasty]
    3: thick cushion used as a seat [syn: ottoman, pouf,
       pouffe, puff, hassock]
    4: a low seat or a stool to rest the feet of a seated person
       [syn: footstool, footrest, ottoman, tuffet]