The Collaborative International Dictionary of English v.0.48:

Ambrosial \Am*bro"sial\ ([a^]m*br[=o]"zhal or
   [a^]m*br[=o]"zh>icr/*al), a. [L. ambrosius, Gr. 'ambro`sios.]
   1. Consisting of, or partaking of the nature of, ambrosia;
      delighting the taste or smell; delicious. "Ambrosial
      food." "Ambrosial fragrance." --Milton.
      [1913 Webster]

   2. Divinely excellent or beautiful. "Shakes his ambrosial
      curls." --Pope.
      [1913 Webster]

WordNet (r) 3.0 (2006):

ambrosial
    adj 1: extremely pleasing to the taste; sweet and fragrant; "a
           nectarous drink"; "ambrosial food" [syn: ambrosial,
           ambrosian, nectarous]
    2: worthy of the gods [syn: ambrosial, ambrosian]