Meaning

originFrom Middle English roke (“fog, vapour, cloud”), probably from Old Norse roka ("whirlwind, fine spray"; compare Old Norse særoka (“seaspray”)), reinforced later by Middle Dutch roke, rooc (“smoke”), from Old Dutch rouc (“steam, vapour”), from Proto-Germanic *raukiz (“smoke”), from Proto-Indo-European *rewg- (“to erupt, vomit, burp”), from *rew- (“to roar, growl, grumble”). Cognate with Scots rok,…

Etymology from Wiktionary, CC BY-SA 3.0