The Collaborative International Dictionary of English v.0.48:
Gluteal \Glu"te*al\, a. [G. ? rump, pl., the buttocks.] (Anat.) Pertaining to, or in the region of, the glut[ae]us. [1913 Webster]WordNet (r) 3.0 (2006):
gluteal adj 1: of or relating to or near the gluteus muscles