Chiefly Pharmacology.

a liquid.
a solution, especially in .

a light greenish-blue color.
having the color aqua.
Historical Examples

His health had given way and he was taking the waters at aquae Solis.
The Unwilling Vestal Edward Lucas White

It is much frequented on account of its hot saline springs, which were known to the Romans under the name aquae Borvonis.
Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 Various

Farinam in mortarium indito, aquae paulatim addito, subigitoque pulchre.
Walden, and On The Duty Of Civil Disobedience Henry David Thoreau

Solet autem ex eo vulnere, ubi parum occursum est, aquae timor nasci, ὑδροφοβίαν Graeci appellant.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 2 Various

Chaves is the ancient aquae Flaviae, famous for its hot saline springs, which are still in use.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 Various

His death afforded the Romans7 more joy than his victory at aquae Sextiae.
Selections from Viri Romae Charles Franois L’Homond

noun (pl) aquae (ˈækwiː), aquas
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
short for aquamarine (sense 2)

“water,” late 14c.; see aqua-. Used in late Middle English in combinations to mean “decoction, solution” (cf. aqua regia, a mix of concentrated acids, literally “royal water,” so called for its power to dissolve gold and other “noble” metals). As the name of a light greenish-blue color, 1936.


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