from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The water from which a river rises; a source. Often used in the plural.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The source (and the initial part) of a stream
from the GNU version of the Collaborative International Dictionary of English
- n. The source and upper part of a stream; -- commonly used in the plural.
from The Century Dictionary and Cyclopedia
- n. One of the upper tributaries of a river: usually in the plural. Also used adjectively.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the source of a river
head + water (Wiktionary)