Search Result for "headrace": 
Wordnet 3.0

NOUN (1)

1. a waterway that feeds water to a mill or water wheel or turbine; 



The Collaborative International Dictionary of English v.0.48:

Headrace \Head"race`\ (-r[=a]s`), n.
   See Race, a water course.
   [1913 Webster]


WordNet (r) 3.0 (2006):

headrace
    n 1: a waterway that feeds water to a mill or water wheel or
         turbine