cyflwr mater

== Welsh == === Noun === cyflwr mater m (plural cyflyrau mater) state of matter ==== Related terms ==== trawsnewidiad gwedd (“phase change”) === Mutation === === Further reading === Delyth Prys; J.P.M. Jones; Owain Davies; Gruffudd Prys (2006), Y Termiadur: termau wedi'u safoni; standardised terminology‎[1] (in Welsh), Cardiff: Awdurdod cymwysterau, cwricwlwm ac asesu Cymru (Qualifications curriculum & assessment authority for Wales), →ISBN