Muriwai (i), n. 1. Backwater, lagoon at the mouth of a river. Taku pokai tarapunga e tu ki te muriwai o Waipara ra (M. 111).
2. Junction of streams. Kai te muriwai o Mimiha, o Mangakakaho. If more than two streams run together at one point the expression nga muriwai is used.
3. Entrance to the subterranean spirit world.
Williams Dictionary
Muriwai (ii), n. A univalve mollusc, similar to māihi, but bitter to the taste.
Williams Dictionary