What does aqueous mean?
The definition of aqueous
A”que*ous, a.
Etym: [Cf. F. aqueux, L. aquosus, fr. aqua. See Aqua, Aquose.]

1 Partaking of the nature of water, or abounding with it; watery. The aqueous vapor of the air. Tyndall.
2 Made from, or by means of, water. An aqueous deposit. Dana. Aqueous extract, an extract obtained from a vegetable substance by steeping it in water.

— Aqueous humor (Anat.), one the humors of the eye; a limpid fluid, occupying the space between the crystalline lens and the cornea. (See Eye.) — Aqueous rocks (Geol.), those which are deposited from water and lie in strata, as opposed to volcanic rocks, which are of igneous origin; — called also sedimentary rocks.