Posted on 7th February 2017 by melyn Terderus is the Cornish word for avid Yes, avid in Cornish is terderus Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Ownek is the Cornish word for afraidNext post: Preydh is the Cornish word for booty