From French-Breton FreeDict Dictionary (Geriadur Tomaz) ver. 0.2.7: caoutchouc /kautʃˈu/ mezell-gwevn (mezelloù-gwevn /məzɛlˈu ɡwˈɛvn/), gom-gwevn
caoutchouc /kautʃˈu/ mezell-gwevn (mezelloù-gwevn /məzɛlˈu ɡwˈɛvn/), gom-gwevn