English: box frame
Welsh: ffrâm flwch
Subject: Ystadau a Cadw
English definition: The outer (hollow) casing of a timber sash box - sash window, which houses the counterbalancing weights, enabling the sashes to move up and down with ease. Early examples were carved out of solid wood, but later made up from separate components. 
Welsh definition: Casin allanol (gwag) ffrâm flwch bren – ffenestr godi, sy’n cadw’r pwysau ffenestr, sy’n galluogi’r fframiau symud i fyny ac i lawr yn rhwydd. Roedd enghreifftiau cynnar wedi eu naddu o bren solet, ond lluniwyd y rhai diweddarach o gydrannau ar wahân.
Welsh context: Ffynhonnell: Taflen wybodaeth gyhoeddus Cyngor Gwynedd.