English: yellow fever
Welsh: y dwymyn felen
Subject: Iechyd
English definition: Caught from the bite of an infected mosquito and occurs in parts of Africa and South America.
Welsh definition: Gallwch gael eich heintio â’r dwymyn felen ar ôl brathiad gan. fosgito wedi ei heintio ac mae’n beryglus mewn rhannau o Affrica a De America.