the ilium or hipbone.
Origin of haunch bone
Middle English word dating back to 1350–1400
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for haunch-bone
Phao heard his teeth crack on a haunch-bone and grunted approvingly.The Second Jungle Book|Rudyard Kipling
British Dictionary definitions for haunch-bone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012