WordNet (r) 3.0 (2006):

catercorner
    adj 1: slanted across a polygon on a diagonal line; "set off in
           a catty-corner direction across the vacant lot" [syn:
           catacorner, cata-cornered, catercorner, cater-
           cornered, catty-corner, catty-cornered, kitty-
           corner, kitty-cornered]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "catercorner":
   across, athwart, bendwise, bias, biased, biaswise, catercornered,
   catercornerways, cornerways, cornerwise, crossways, crosswise,
   diagonal, diagonally, diagonalwise, kittycorner, on the bias,
   slant, thwart, transverse