cater-cornered

from WordNet (r) 3.0 (2006)

cater-cornered
    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}]

from The Collaborative International Dictionary of English v.0.48

Cater-cornered \Ca"ter-cor`nered\, a. [Cf. {Cater} to cut
   diagonally.]
   Diagonal. [Colloq.]
   [1913 Webster]