Source : Webster's Revised Unabridged Dictionary (1913)

Gastronomic \Gas`tro*nom"ic\, Gastronomical \Gas`tro*nom"ic*al\,
   a. [Cf. F. gastronomique.]
   Pertaining to gastromony.

Source : WordNet®

gastronomical
     adj : of or relating to gastronomy; "gastronomic adventures" [syn:
            {gastronomic}]