Posted on 13th July 2012 by melyn Radyoweythresek is the Cornish word for radioactive Yes, radioactive in Cornish is radyoweythresek Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Devisya is the Cornish word for deviseNext post: Gwith is the Cornish word for care