Plural of easterly; winds that blow from the east, or regions that lie toward the east.
From 'easterly' (adjective: coming from the east) plus plural '-s'. The suffix '-erly' comes from Old English '-ern' (direction marker), appearing in weather terminology since medieval times.
The trade winds that powered colonial ships were called 'easterlies'—these weren't just weather words but the invisible highways that shaped global history and determined which nations could build empires.
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