A large, flat sheet of floating sea ice, typically found in Arctic and Antarctic regions.
From Norwegian 'flo' (layer, slab), related to Old Norse 'flö.' The word entered English through Arctic exploration and whaling industry terminology.
Arctic explorers couldn't describe their frozen world without borrowing this Norwegian word—'floe' specifically means the *sheet* of ice, not icebergs, and it was literally a matter of life and death to know the difference!
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