a·quat·ic [? kw?tik] adjective 1. of water: connected with, consisting of, or dependent on water 2. living in water: living or growing in water 3. done in water: played or performed in or on water aquatic sports noun (plural a·quat·ics) water plant or animal: a plant or animal that lives or grows in water -a·quat·i·cal·ly, adverb