The word extremest appears in the following sentences from Moby-Dick:
Chapter 1 > Paragraph 4 > Sentence 3:
Nothing will content them but the extremest limit of the land; loitering under the shady lee of yonder warehouses will not suffice.
Chapter 93 > Paragraph 10 > Sentence 4:
It was a beautiful, bounteous, blue day! the spangled sea calm and cool, and flatly stretching away, all round, to the horizon, like gold-beater's skin hammered out to the extremest.
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