Posted on 2nd December 2017 by melyn Mamveth is the Cornish word for foster-mother Yes, foster-mother in Cornish is mamveth Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Post navigationPrevious post: Gwettha is the Cornish word for worstNext post: Skaldyans is the Cornish word for blight