Definition of straddleback:
(n) :
A saddle-shaped ridge forming a shallow pass between two peaks.
(n) :
A roof in the same shape, having a gable at each end.
(n) :
(architecture) A coping that is thicker in the middle than at the edges.
(n) :
Any of various creatures having a saddle-shaped marking on the back.
(n) :
A breed of pig which is black with a pink saddle-shaped marking.
(n) :
(geology) An anticline.