1. Consisting of, relating to, or being in water: "an aquatic environment" or "an aquatic habitat" (ponds, lakes, streams, oceans, etc.).
2. Living or growing in, on, or near the water: "aquatic animals and plants".
3. Taking place or practiced on or in water: "aquatic sports".

1. An organism or organisms that live in, on, or near the water: "He is investigating various kinds of aquatics for his biological report."
2. Athletic activities performed in or on the water: "They were enjoying the summer aquatics in Florida."

An animal having a water habitat.

Aquatic animals require a watery habitat, but do not necessarily have to live entirely in water.

Animal environments are classified as either aquatic (water), terrestrial (land), or amphibious (water and land).

Wading and swimming and diving birds of either fresh or salt water.

1. Plants that grow partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage; such as, the water hyacinth; also known as: water plants, hydrophytes, hydrophytic plants.
2. A species of plant that has adapted to living in or on aquatic environments.

A reference to the process whereby an aquatic animal obtains oxygen from the surrounding water.

An animal or animals living wholly or chiefly in or on water.