from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Relating to, similar to, containing, or dissolved in water; watery.
  • adjective Geology Formed from matter deposited by water, as certain sedimentary rocks.

from The Century Dictionary.

  • Of the nature of water; abounding with water; formed by water; watery: as, an aqueous solution.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Partaking of the nature of water, or abounding with it; watery.
  • adjective Made from, or by means of, water.
  • adjective an extract obtained from a vegetable substance by steeping it in water.
  • adjective (Anat.) one the humors of the eye; a limpid fluid, occupying the space between the crystalline lens and the cornea. (See Eye.)
  • adjective (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective chemistry Consisting mostly of water.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective produced by the action of water
  • adjective similar to or containing or dissolved in water


from The American Heritage® Dictionary of the English Language, 4th Edition

[From Medieval Latin aqueus, from Latin aqua, water; see aqua.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Middle French aqueux, from Medieval Latin aqueus.


  • "It may seem fantastic, but the fact that in aqueous solution, [the] water component can be slowly supercooled to the glassy state and warmed back without the crystallization implies that, in principle, if the suitable cryoprotectant is created, cells in plants and living matter could withstand a large supercooling and survive," Bogdan explained.

    Boing Boing

  • If yellow hexacyanoferrate (II) is mixed with Fe (III) chloride in aqueous solution, 'Prussian blue' is formed.

    The Nobel Prize in Chemistry 1992

  • With the help of the Marcus model we have understood why, for example, iron ions in aqueous solution exchange electrons slowly.

    The Nobel Prize in Chemistry 1992

  • Arrhenius got the prize because he convinced his contemporary chemists that salts in aqueous solutions exist as positive and negative ions and not as neutral molecules.

    The Nobel Prize in Chemistry 1983 - Presentation Speech

  • After Arrhenius had formulated his well-known theory that acids and bases in aqueous solution are separated into ions and that their strength depends on their electrical conductivity, or more accurately, on their degree of dissociation, Ostwald tested the correctness of this view by measuring the conductivity and hence the concentration of the hydrogen and hydroxyl ions with the acids and bases which he had used in his previous experiments.

    Nobel Prize in Chemistry 1909 - Presentation Speech

  • He desires to state again that he cannot regard such experiments as conclusive, and believes that they are of comparative value only, as such experiments do not measure in any large degree the pressure of the solid material but only all or a portion of the so-called aqueous matter, that is, the liquid and very fine material which flows with it.

    Pressure, Resistance, and Stability of Earth American Society of Civil Engineers: Transactions, Paper No. 1174, Volume LXX, December 1910

  • Conditions: 1 = normal sand, 2 = dry sand, 3 = supersaturated firm sand with 40\% of voids, 4 = supersaturated semi-aqueous material, 60\% aqueous, that is, 60\% water and aqueous material.

    Pressure, Resistance, and Stability of Earth American Society of Civil Engineers: Transactions, Paper No. 1174, Volume LXX, December 1910

  • The anterior chamber occupies the space between the cornea and the iris, and is filled with a thin, watery fluid called the aqueous humor.

    A Practical Physiology

  • The absorption from atmospheric causes of radiant enemy in these parts he showed was due to "water-stuff," which he hesitated to call aqueous vapor, since the banded spectrum of water was present, and not lines.

    Scientific American Supplement, No. 363, December 16, 1882

  • If the cutaneous branch of absorbents gains a habit of being excited into stronger action, and imbibes greater quantities of moisture from the atmosphere, at the same time that the urinary branch has its motions inverted, another kind of diabetes is formed, which may be termed the aqueous diabetes.

    Zoonomia, Vol. I Or, the Laws of Organic Life


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