English: non-conforming use
Welsh: defnydd anghydffurfiol
Subject: Cynllunio
English definition: A use which does not conform to the general provisions of the development plan for the area in which it is located.
Welsh definition: Defnydd nad yw'n cydymffurfio â darpariaethau cyffredinol y cynllun datblygu ar gyfer yr ardal y mae ynddo.