This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A mass of the earth's crust that lies between two faults and is higher than the surrounding land.

n. an area of the earth's surface which is raised relative to surrounding land

"The first fact that we infer from the former existence of such a temperature distribution is the improbability, indeed the impossibility, that anything resembling a rigid obstacle, or deep-seated "horst," can have existed beneath the present surface-level, and opposed the northerly movement of the deep-lying synclines."

earth's crust    crust   

divorced    endorsed    enforced    forced    horsed    outsourced    reinforced    unenforced    unhorsed