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of, in, or pertaining to water.
living or growing in water:
aquatic plant life.
taking place or practiced on or in water:
aquatic sports.
an aquatic plant or animal.
aquatics, sports practiced on or in water.
Contemporary Examples

Swimmers now enjoy its 12,000-square-meter aquatic theme park.
Architectural White Elephants: Beijing, London, and the Post-Olympics Curse Melinda Liu August 13, 2012

They said that in any case the incident only highlights their worry that the Gulf is an aquatic tinderbox.
Shocking Gulf Firefight Caught on Tape Michael Adler July 4, 2011

Historical Examples

However, the earliest representatives of these great types were all aquatic.
The Edinburgh New Philosophical Journal, Vol. XLIX Various

It feeds principally on fish, crustaceans, and aquatic insects.
The Western World W.H.G. Kingston

Each of them sustains on his outstretched arms an ingenious arrangement of fishes, aquatic birds, and lotus flowers.
A History of Art in Ancient Egypt, Vol. II (of 2) Georges Perrot

The “aquatic kettle” was doubtless the embryo of the diving-bell.
Under the Waves R M Ballantyne

Gill, gil, n. one of the breathing organs in fishes and certain other aquatic animals: the flap below the bill of a fowl.
Chambers’s Twentieth Century Dictionary (part 2 of 4: E-M) Various

No root, except those of aquatic plants, will grow in stagnant water.
Farm drainage Henry Flagg French

The aquatic world about them had grown steadily wilder, more remote from the haunts of men.
Diane of the Green Van Leona Dalrymple

Strange sensations are experienced in these aquatic scrambles.
The Log of the Sun William Beebe

adjective
growing, living, or found in water
(sport) performed in or on water
noun
a marine or freshwater animal or plant
adj.

late 15c., from Middle French and Old French aquatique (13c.), from Latin aquaticus “growing in water; bringing rain,” from aqua “water” (see aqua-)
aquatic
(ə-kwāt’ĭk)
Relating to, living in, or growing in water.