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Definition: Bodies of surface water in the vicinity of river mouths which are partly saline in character as a result of their proximity to coastal waters but are substantially influenced by freshwater.
Context: Gall y term ‘transitional waters’ hefyd olygu morlynnoedd a ffiordau. Os oes angen defnyddio term nad yw mor benodol â ‘dyfroedd aberol’, gellid defnyddio term fel ‘dyfroedd lled groyw’.
