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Definition: Alcohol neu unrhyw sylwedd neu gynnyrch arall all gael ei ddefnyddio i achosi meddwdod (naill ai drwy ei fewnanadlu ef neu ei darth, neu fel arall), ac nad yw'n gyffur rheoledig fel y'i diffiniwyd gan adran 2 o Ddeddf Camddefnyddio Cyffuriau 1971.