Definition of waterhead

  1. 1 :  the source or headwater of a stream

  2. 2 :  a dammed up body of water (as for supplying a garden or mill); also :  the height or quantity so retained

  3. 3a :  a large head; especially :  hydrocephalus b chiefly dialectal :  one with an excessively large head and usually subnormal intelligence

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