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April fool one upon whom a trick or practical joke is played on April Fools' Day.
April Fools' Day the first day of April, when tricks and practical jokes are customarily played on unsuspecting people.
a priori proceeding from cause to effect or from the general to the particular; deductive. [3 definitions]
apron a garment covering all or part of the front of the body, usu. worn to protect the wearer's clothing. [3 definitions]
apropos appropriate; relevant; opportune. [4 definitions]
apse a projection at the end of a church or other building, usu. having a domed or arched roof.
apt appropriate; suitable. [4 definitions]
apt. abbreviation of "apartment," a room or set of rooms used as living space by a single household and usu. located in a building containing a number of such rooms or sets of rooms.
apterous having no wings or parts resembling wings, as certain insects.
apteryx see "kiwi."
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]