west·​most | \ˈwes(t)mōst, especially British also -məst\

Definition of westmost 

: westernmost the appeal of our westmost land is in its … terrain, climate— Aubrey Drury

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First Known Use of westmost

before the 12th century, in the meaning defined above

History and Etymology for westmost

alteration (influenced by most entry 1) of Middle English westmest, from Old English, superlative of west, adverb

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The first known use of westmost was before the 12th century

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a nest or breeding place

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