Hypertext Webster Gateway: "watershed"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Watershed \Wa"ter*shed`\, n. [Cf. G. wasserscheide; wasser water
+ scheide a place where two things separate, fr. scheiden to
separate.]
1. The whole region or extent of country which contributes to
the supply of a river or lake.
2. The line of division between two adjacent rivers or lakes
with respect to the flow of water by natural channels into
them; the natural boundary of a basin.
From WordNet (r) 1.7 (wn)
watershed
n : a line that divides two adjacent river systems [syn: {water
parting}, {divide}]
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