steptoe

[step-toh]
noun Western U.S.
an isolated hill or mountain surrounded by lava.

Origin:
step + toe

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

steptoe

a hill or mountain that projects like an island above a surrounding lava field. This landform, a type of kipuka (q.v.), is named after Steptoe Butte, a quartzite protrusion above the Columbia Plateau lava flows near Colfax, Washington, U.S

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Steptoe did not germinate well following any treatment.
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