The Collaborative International Dictionary of English v.0.48:
Peritoneal \Per`i*to*ne"al\, a. [Cf. F. p['e]riton['e]al.] (Anat.) Of or pertaining to the peritoneum. [1913 Webster]WordNet (r) 3.0 (2006):
peritoneal adj 1: of or relating to or affecting the peritoneum; "peritoneal cancer"