English: segmental headed
Welsh: pen cylchrannol
Subject: Ystadau a Cadw
English definition: As opposed to a flat or semicircular arch or elliptical arch, a curved arch which is formed out of a small segment of a circle. A window in such an arch should normally follow the same curve, but in replacement work the window is often made with a flat head, and the remaining space filled solid.
Welsh definition: O gymharu â bwa gwastad neu fwa hanner cylch neu fwa eliptaidd, bwa crwm wedi ei lunio o rannau bychain o gylch. Fel arfer, dylai ffenestr mewn bwa o’r fath ddilyn yr un gromlin, ond mewn gwaith amnewid bydd gan y ffenestr ben gwastad yn aml, a gweddill y lle gwag wedi ei lenwi.
Welsh context: Ffynhonnell: Taflen wybodaeth gyhoeddus Cyngor Gwynedd.