Source : Webster's Revised Unabridged Dictionary (1913)

Areal \A"re*al\, a. [Cf. L. arealis, fr. area.]
   Of or pertaining to an area; as, areal interstices (the areas
   or spaces inclosed by the reticulate vessels of leaves).

Source : WordNet®

areal
     adj : of or relating to or involving an area