sway·back 
(swābăk′)
(swābăk′)n.
Excessive inward or downward curvature of the spine, especially in a horse.
swaybacked′ adj.
- multifold
- multiform
- multiformity
- multigenerational
- multigrain
- multigravida
- multilane
- multilateral
- multilateralism
- multilateralist
- multilaterally
- multilayered
- multilevel
- multilingual
- multilingualism
- multilocular
- multimedia
- multimeter
- multimillionaire
- multinational
- multinationalism
- multinomial
- multinomial theorem
- multinuclear
- multinucleate