Aqua is a color, specifically blue-green. It can also refer to water or any liquid substance.
Usage examples
Aquamarine: The beautiful aqua-colored gemstone.
Aquatic animals: Dolphins, fish, and turtles are some examples of aqua-dwelling creatures.
Aqua aerobics: A form of exercise performed in water to improve fitness and cardiovascular health.
Aqua park: A recreational water park with various water slides, pools, and attractions.
Aqua therapy: The use of water exercises and treatments for therapeutic purposes, often used for rehabilitation and relief from certain medical conditions.
Aqua sports: Activities such as surfing, paddleboarding, and water skiing that are performed on or in water.
Aqua vitae: An alcoholic beverage, historically known as the "water of life" in Latin.
Aqua-lung: An early name for a scuba diving apparatus that allows underwater breathing.
Aqua regia: A highly corrosive mixture of nitric and hydrochloric acids, often used in chemical laboratories.
Aqua blue: A shade of blue that resembles the color of water.
This is a lovely dress that comes in a delightful shade of aqua blue with pink flowers and blue birds. (dresshead.com)
I used my favorite color of aqua blue paint and some fancy new hardware to completely transform this dresser into something that looks amazing in our master bedroom. (livelovediy.com)
I have a dark piece similar to yours that I would like to do in aqua for my daughters surf themed bed room. (dailydoseofstyle.com)