The Collaborative International Dictionary of English v.0.48:

Canopy \Can"o*py\ (k[a^]n"[-o]*p[y^]), n.; pl. Canopies
   (-p[i^]z). [OE. canapie, F. canap['e] sofa, OF. conop['e]e,
   conopeu, conopieu, canopy, vail, pavilion (cf. It. canop[`e]
   canopy, sofa), LL. conopeum a bed with mosquito curtains, fr.
   Gr. kwnwpei^on, fr. kw`nwps gnat, kw`nos cone + 'w`ps face.
   See Cone, and Optic.]
   1. A covering fixed over a bed, dais, or the like, or carried
      on poles over an exalted personage or a sacred object,
      etc. chiefly as a mark of honor. "Golden canopies and beds
      of state." --Dryden.
      [1913 Webster]

   2. (Arch.)
      (a) An ornamental projection, over a door, window, niche,
          etc.
      (b) Also, a rooflike covering, supported on pillars over
          an altar, a statue, a fountain, etc.
          [1913 Webster]