The Collaborative International Dictionary of English v.0.48:

Delectable \De*lec"ta*ble\, a. [OF. delitable, OF. delitable, F.
   d['e]lectable, fr. L. delectabilis, fr. delectare to delight.
   See Delight.]
   1. Highly pleasing; delightful.
      [1913 Webster]

            Delectable both to behold and taste.  --Milton.

   2. extremely pleasing to the sense of taste; same as
      luscious, 1.

   Syn: delicious, luscious, pleasant-tasting, scrumptious,
        toothsome, yummy.
        [WordNet 1.5] -- De*lec"ta*ble*ness, n. --
        De*lec"ta*bly, adv. -- De*lec`ta*bil"i*ty, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

delectability
    n 1: extreme appetizingness [syn: delectability,
         deliciousness, lusciousness, toothsomeness]