English: sash
Welsh: ffrâm
Subject: Ystadau a Cadw
English definition: A frame of timber containing glass panes or a single glass pane, originally from the French word chassis (meaning frame). Sometimes confusingly, in older documents, having the same meaning as casement. 
Welsh definition:  Ffrâm bren sy’n cynnwys cwarelau gwydr neu un paen o wydr. Daw’r gair Saesneg sash yn wreiddiol o’r Ffrangeg, chassis (ffrâm). Weithiau, gan beri dryswch mewn hen ddogfennau, mae gan y gair yr un ystyr â casment.
Welsh context: Ffynhonnell: Taflen wybodaeth gyhoeddus Cyngor Gwynedd.