saddle block
n (Surgery) surgery a type of spinal anaesthesia producing sensory loss in the buttocks, inner sides of the thighs, and perineum
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014