Etymology
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lough (n.)
"a lake, pool," early 14c., Anglo-Celtic, representing a northern form of Irish and Gaelic loch, Welsh llwch, from PIE *laku- (see lake (n.1), and compare loch).
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loofah (n.)
1879 (as lough, 1865), from Egyptian Arabic lufah, the name of the plant (Luffa ægyptiaca) with fibrous pods from which flesh-brushes are made.
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boycott 
1880, noun and verb, "to combine in refusing to have dealings with, and preventing or discouraging others from doing so, as punishment for political or other differences." From Irish Land League ostracism of Capt. Charles C. Boycott (1832-1897), land agent of Lough-Mask in County Mayo, who refused to lower rents for his tenant farmers. Quickly adopted by newspapers in languages as far afield as Japanese (boikotto). The family name is from a place in England. Related: Boycotted; boycotter; boycotting.
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loch (n.)

late 14c., from Gaelic loch "lake, lake-like body," including the narrow, nearly land-locked arms of the sea found in the glacier-scoured landscape of west Scotland; cognate with Old Irish loch "body of water, lake," Breton lagen, Anglo-Irish lough, Latin lacus (see lake (n.1)). "The word was adopted in ONorthumbrian as luh" [OED]. The diminutive form is lochan.

The phrase Loch Ness monster is attested by 1934, the thing itself under slightly different names from 1933. The loch is named for the river Ness that flows out of it at Inverness; the river name is probably from an Old Celtic word meaning "roaring one."

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