Source : Webster's Revised Unabridged Dictionary (1913)

Entablature \En*tab"la*ture\ (?; 135), n. [OF. entablature: cf.
   It intavolatura, fr. LL. intabulare to construct a basis; L.
   in + tabulatum board work, flooring, fr. tabula. See
   {Table}.] (Arch.)
   The superstructure which lies horizontally upon the columns.
   See Illust. of {Column}, {Cornice}.

   Note: It is commonly divided into architrave, the part
         immediately above the column; frieze, the central
         space; and cornice, the upper projecting moldings.
         --Parker.

Source : WordNet®

entablature
     n : (architecture) the structure consisting of the part of a
         classical temple above the columns between a capital and
         the roof