noun. An area of land formed or lying at the foot of a mountain or mountain range.

adjective. Of, relating to, or constituting such an area of land.

noun. Any region of foothills of a mountain range.

adjective. Formed or lying at the foot of a mountain range.

"The sharp relief of the mountains, with their grass-covered summits, precipitous slopes and flat open piedmont, is formed by a ridge of iron-quartzite emerging from softer metamorphic rocks."