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Definition: Yng nghyd-destun adeiladau deunydd a roddir dros fath arall o ddeunydd ar du allan adeilad, yn bennaf i insiwleiddio, i amddiffyn yr adeilad rhag yr elfennau, neu i wella golwg yr adeilad.
Context: Os oes gan yr adeilad gladin allanol, beth yw deunydd allanol y cladin?