| April |
the fourth month of the Gregorian calendar year, having thirty days. |
| 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. |