The Collaborative International Dictionary of English v.0.48:

floored \floored\ adj.
   1. provided with a floor. ceilinged
      [WordNet 1.5]

   2. knocked down to the floor or ground.
      [PJC]

   3. defeated; overwhelmed.
      [PJC]

   4. suprised and confounded; nonplused; as, I was floored by
      the brilliance of the solution.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Floor \Floor\, v. t. [imp. & p. p. Floored; p. pr. & vb. n.
   Flooring.]
   1. To cover with a floor; to furnish with a floor; as, to
      floor a house with pine boards.
      [1913 Webster]

   2. To strike down or lay level with the floor; to knock down;
      hence, to silence by a conclusive answer or retort; as, to
      floor an opponent.
      [1913 Webster]

            Floored or crushed by him.            --Coleridge.
      [1913 Webster]

   3. To finish or make an end of; as, to floor a college
      examination. [Colloq.]
      [1913 Webster]

            I've floored my little-go work.       --T. Hughes.
      [1913 Webster]

WordNet (r) 3.0 (2006):

floored
    adj 1: provided with a floor [ant: ceilinged]