'Haunches of an arch' definitions:

Definition of 'Haunches of an arch'

From: GCIDE

Haunch \Haunch\ (h[aum]nch; 277), n. [F. hanche, of German origin; cf. OD. hancke, hencke, and also OHG. ancha; prob. not akin to E. ankle.]
1. The hip; the projecting region of the lateral parts of the pelvis and the hip joint; the hind part. [1913 Webster]
2. Of meats: The leg and loin taken together; as, a haunch of venison. [1913 Webster]
Haunch bone. See Innominate bone, under Innominate.
Haunches of an arch (Arch.), the parts on each side of the crown of an arch. (See Crown, n., 11.) Each haunch may be considered as from one half to two thirds of the half arch. [1913 Webster]