Posted on 25th August 201721st May 2017 by melyn Tewyn is the Cornish word for dune Yes, dune in Cornish is tewyn Photo by Darren Flinders Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Lows is the Cornish word for looseNext post: Korsyer is the Cornish word for cruiser