lemon sole 
noun
A common European flatfish of the plaice family. It is an important food fish.
- Microstomus kitt, family Pleuronectidae.
- Michael's main course of grilled lemon sole with langoustine butter was good, but not extraordinary.
- The food, though, remained a class apart, as I found when I ordered the roulade of smoked salmon and lemon sole.
Origin
Mid 19th century: lemon from French limande, of unknown origin.