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aptitude ability to learn quickly. [2 definitions]
aptitude test a test intended to measure the probable ability of an untrained person to perform well in a particular job or course of study.
apyretic having no fever.
aqua a light greenish blue or blue-green color. [2 definitions]
aquaculture the cultivation of water plants, fish, shellfish, and other aquatic animals in controlled freshwater or saltwater environments.
Aquadag in electronics, trademark for the graphite coating on the inside of some cathode ray tubes.
aqua fortis see "nitric acid."
Aqua-Lung trademark for an underwater breathing device similar to a scuba.
aquamarine a type of bluish green beryl used in jewelry. [2 definitions]
aquanaut a person who lives in an undersea dwelling, esp. for purposes of scientific exploration and study.
aquaplane a board pulled by a speedboat and used to carry a standing rider along the surface of the water. [3 definitions]
aqua pura pure water.
aqua regia a volatile, corrosive mixture of nitric and hydrochloric acids, used for dissolving gold and platinum and for testing metals.
aquarelle (French) watercolor painting with transparent colors, or a painting done by this technique.
aquarist one who maintains a private aquarium or is curator or director of a public aquarium.
aquarium an artificial pond or container filled with water in which aquatic forms of life are kept. [2 definitions]
Aquarius an autumn zodiacal constellation located between Capricornus and Pisces; Water Bearer. [3 definitions]
aquatic of, in, or taking place on the water. [4 definitions]
aquatint a type of etching that achieves the soft sweeping tones of a wash drawing or watercolor by careful control of the length of time acid is left on any given area of the etching plate.
aquavit a strong, colorless Scandinavian liquor flavored with caraway seeds.
aqua vitae alcohol. [2 definitions]