Aquatic means living in water. Aquatic plants, aquatic animals, an aquatic environment.
It covers fresh and salt water alike, where marine means the sea specifically — that distinction matters in ecology. Aquatic plants have to solve gas exchange and support differently from land plants, which is why they look as they do. Aquatics as a noun covers the water sports together. Note that the Latin aqua gives aquarium, aqueduct and the French eau.
1adjectiveaquaticLiving in water.
“Frogs, fish and other aquatic creatures live in the pond.”
aquatic is a quality of living in water.
Latin aquaticus comes from aqua, water. Aquarium, aqueduct and the French eau come from the same water.
Latin
aquāticus
Middle French
aquatique
English, today
aquatic
Built from
Borrowed from Middle French aquatique, from Latin aquāticus. Borrowed from Middle French aquatique (“living in water”), from Latin aquaticus (“relating to water”), from aqua (“water”).
Etymology from Wiktionary, CC BY-SA