hip 1 
(hĭp)
(hĭp)n.
1.
a. The laterally projecting prominence of the pelvis or pelvic region from the waist to the thigh.
b. A homologous posterior part in quadrupeds.
c. The hip joint.
2. Architecture The external angle formed by the meeting of two adjacent sloping sides of a roof.
[Middle English, from Old English hype.]