The Collaborative International Dictionary of English v.0.48:
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). [1913 Webster]WordNet (r) 3.0 (2006):
areal adj 1: of or relating to or involving an area