[ey-kwee-uhs, ak-wee-]
of, like, or containing water; watery: an aqueous solution.
(of rocks or sediments) formed of matter deposited in or by water.

1635–45; aqu(a) + -eous

aqueously, adverb
aqueousness, noun
nonaqueous, adjective
superaqueous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aqueous (ˈeɪkwɪəs, ˈækwɪ-)
1.  of, like, or containing water
2.  dissolved in water: aqueous ammonia
3.  (of rocks, deposits, etc) formed from material laid down in water
[C17: from Medieval Latin aqueus, from Latin aqua water]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1640s, from L. aqua "water," on analogy of Fr. aqueux "watery" (which, however, is from L.L. aquosus "abounding in water"). Aqueous humor attested from 1640s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

aqueous a·que·ous (ā'kwē-əs, āk'wē-)
Relating to, similar to, containing, or dissolved in water; watery.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
aqueous   (ā'kwē-əs)  Pronunciation Key 
  1. Chemistry Relating to or dissolved in water.

  2. Geology Formed from matter deposited by water. Certain sedimentary rocks, such as limestone, are aqueous.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Indeed, it is able to displace water and thus adhere to surfaces in aqueous
It seemed to mark the dawning of some new aqueous age.
The team then shined a flashlight-size near-infrared laser on aqueous solutions
  of both tumor and normal cells.
Crews extinguished the fire with aqueous film forming foam.
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