Definition of "Blackwater"

Blackwater

proper noun
1. A surname from Navajo used by the Navajo people.
2. A river in Essex, England, which flows into the North Sea at Bradwell.
  Quotations
  The principal water-barrier of this type is the muddy estuary of the tidal River Blackwater, which is last bridged in the seaward direction at the ancient town of Maldon. […] In those days, yachting on the east coast was a favourite relaxation, and it was proposed to extend the line for 1¾ miles to a pier on the River Blackwater, where yachts could be moored.
  1950 December, R. C. J. Day and R. K. Kirkland, “The Kelvedon & Tollesbury Light Railway”, in Railway Magazine, pages 838, 839
3. A river in Hampshire, Surrey and Berkshire, England, which joins the River Loddon; the Hampshire town of Blackwater is on this river.
4. A river in Wiltshire and Hampshire, England, which joins the River Test.
5. A village near St Agnes, Cornwall.
6. A town in Blackwater and Hawley parish, Hart district, Hampshire, England (OS grid ref SU8559).
7. A village in Arreton parish, Isle of Wight, England (OS grid ref SZ5086).
8. Any of several rivers in Ireland:
  1. A river in County Fermanagh and County Armagh, Northern Ireland, with a stretch on the border with County Monaghan, Ireland; the river flows into Lough Neagh.