aqua

[ak-wuh, ah-kwuh]
noun, plural aquae [ak-wee, ah-kwee] , aquas.
1.
Chiefly Pharmacology.
b.
a liquid.
c.
a solution, especially in water.
2.
a light greenish-blue color.
adjective
3.
having the color aqua.

Origin:
1350–1400; Middle English < Latin: water

Dictionary.com Unabridged

aqua-

variant of aqui-.

Origin:
probably orig. attributive use of aqua, or generalized from words in which it is etymologically the head noun of a phrase, as aquamarine, aquatint

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aqua (ˈækwə)
 
n , pl aquae, aquas
1.  water: used in compound names of certain liquid substances (as in aqua regia) or solutions of substances in water (as in aqua ammoniae), esp in the names of pharmacological solutions
 
adj
2.  short for aquamarine
 
[Latin: water]

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

aqua-
combination element or prefix meaning "water," from L. aqua "water," cognate with P.Gmc. *akhwo, source of O.E. ea "river," Goth. ahua "river, waters," O.N. Ægir, name of the sea-god, O.E. ieg "island;" all from PIE *akwa- "water" (cf. Skt. ap "water," Hitt. akwanzi "they drink," Lith. uppe "a
river").

aqua
light greenish-blue color, 1936, from aqua-.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
There are many questions concerning the sustainability of aqua farming, none of
  which were raised by the author.
Now only limited number of aqua farms are in operation.
Who really knows what shrimp will cost ten years from now especially if the
  only place you can get them is from an aqua farm.
What is more some of the fertile lands converted into aqua farms turned saline.
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