Search Result for "headwater": 
Wordnet 3.0

NOUN (1)

1. the source of a river;
- Example: "the headwaters of the Nile"



The Collaborative International Dictionary of English v.0.48:

Headwater \Head"wa`ter\ (-w[=a]`), n.
   The source and upper part of a stream; -- commonly used in
   the plural; as, the headwaters of the Missouri.
   [Webster 1913 Suppl.]


WordNet (r) 3.0 (2006):

headwater
    n 1: the source of a river; "the headwaters of the Nile"