English: electric bus
Welsh: bws trydan
Subject: Cynllunio
English context: Electric buses will become increasingly commercialised over the next decade as battery technology improves. 
Welsh context: Bydd bysiau trydan yn cael eu masnacheiddio fwyfwy yn ystod y degawd nesaf wrth i dechnoleg batris wella. 
Plural: bysiau trydan