English: blind box
Welsh: bocs llen
Subject: Ystadau a Cadw
English definition: A shaped timber pelmet on the outside of a window (generally of the Regency period and later) which concealed a blind when folded away. 
Welsh definition: Pelmet pren wedi ei siapio ar y tu allan i ffenestr (yn gyffredinol o gyfnod y Rhaglywiaeth neu wedyn) a guddiai len wedi ei blygu a’i gadw.
Welsh context: Ffynhonnell: Taflen wybodaeth gyhoeddus Cyngor Gwynedd.