English: float glass
Welsh: gwydr nofiol
Subject: Ystadau a Cadw
English definition: Glass sheets made by floating molten glass on a surface of molten metal, thereby producing a smooth relatively flat surface which does not need polishing. 
Welsh definition: Dalennau o wydr a ffurfir drwy adael i wydr tawdd arnofio ar wyneb metel tawdd, gan gynhyrchu wyneb esmwyth a chymharol wastad nad oes angen ei loywi.
Welsh context: Ffynhonnell: Taflen wybodaeth gyhoeddus Cyngor Gwynedd.