From Middle English stroke, strok, strak, from Old English *strāc (“stroke”), from Proto-Germanic *straikaz (“stroke”), from Proto-Indo-European *streyg- (“stroke; to strike”). Cognate with Scots strak, strake, straik (“stroke, blow”), Middle Low German strēk (“stroke, trick, prank”), German Streich (“stroke”). In its British sense as a name for the slash ⟨ / ⟩, a contraction of oblique stroke, a variant of oblique originally employed in telegraphy.
Borrowed from English stroke.
From Old English *strāc, from Proto-Germanic *straikaz.