English: jamb
Welsh: cilbost
Subject: Ystadau a Cadw
English definition: The side of an opening in a wall, for a door or window; or that part of a frame which sits against the side of an opening.
Welsh definition: Ochr agoriad mewn mur, ar gyfer drws neu ffenestr; neu’r rhan o’r ffrâm sy’n pwyso yn erbyn ochr yr agoriad. Hefyd defnyddir ‘ystlysbost’
Welsh context: Ffynhonnell: Taflen wybodaeth gyhoeddus Cyngor Gwynedd.