English: circular
Welsh: cylchlythyr
Subject: Cynllunio
English definition: Guidance, including policy, issued by a government department usually, but not always, in support of legislation.
Welsh definition: Arweiniad, yn cynnwys polisi a gyhoeddir gan adran y llywodraeth sy'n arferol, ond ddim bob tro, yn cefnogi deddfwriaeth.