English: Rich Text Format
Welsh: Fformat Testun Cyfoethog
Subject: TGCh
English definition: RTF. A proprietary file format developed by Microsoft intended to facilitate easy transfer across different applications, programs, and technical environments.
Welsh definition: Fformat ffeil perchnogol a ddatblygwyd gan Microsoft er mwyn hwyluso trosglwyddo'n hawdd ar draws gwahanol gymwysiadau, rhaglenni ac amgylcheddau technegol.