Hypertext Webster Gateway: "hydrosphere"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Hydrosphere \Hy"dro*sphere\, n. [Pref. hydro-, 1 + sphere.]
1. (Meteor.) The aqueous vapor of the entire atmosphere.
2. (Phys. Geog.) The aqueous envelope of the earth, including
the ocean, all lakes, streams, and underground waters, and
the aqueous vapor in the atmosphere.
From WordNet (r) 1.7 (wn)
hydrosphere
n : the watery layer of the earth's surface; includes water
vapor
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