helyg y môr

== Welsh == === Noun === helyg y môr (plural, singular helygen y môr f, not mutable) sea buckthorn (Hippophae rhamnoides) ==== Synonyms ==== rhafnwydd y môr === Mutation === === Further reading === Griffiths, Bruce; Glyn Jones, Dafydd (1995), “buckthorn”, in Geiriadur yr Academi: The Welsh Academy English–Welsh Dictionary‎[1], Cardiff: University of Wales Press, →ISBN