Posted on 9th February 2018 by melyn Peswartenwennel is the Cornish word for quadrilateral Yes, quadrilateral in Cornish is peswartenwennel Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Ferla is the Cornish word for fairgroundNext post: Avaylya is the Cornish word for avail