In the Great German epic called The Nibelungen-Lied, this word is used six or eight times for a broadsword.
His fiddlestick he grasped, `twas massy, broad, and long, As sharp as any razor.
My fiddlestick's no feather; on whom I let it fall, If he has friends that love him, 'twill set them weeping all.
His fiddlestick, sharp-cutting, can hardest steel divide, And at a stroke can shiver the morion's beamy pride.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894