English: terabyte
Welsh: terabeit
Subject: TGCh
English definition: This is a measure of computer storage that is considered 2 to the 40th power or approximately a trillion bytes (or a thousand gigabytes).
Welsh definition: Mesur o storio cyfrifiadurol yw hwn a ystyrir yn 2 i'r 40fed pŵer neu tua thriliwn beit (neu fil gigabeit).