gwair merllyn

== Welsh == === Etymology === gwair (“hay”) + merllyn (“body of stagnant water”) === Noun === gwair merllyn m (plural gweiriau merllyn) quillwort (Isoetes spp.) Synonym: diosglys lake quillwort, Merlin's grass (Isoetes lacustris) Synonym: diosglys merllyn ==== Derived terms ==== gwair merllyn bach (“spring quillwort”) gwair merllyn y tir (“land quillwort”) === References ===