Word origins

• appropinquateTo approach; to near.
• appropinquationThe act of drawing near; an approach.
• appulseAn energetic movement towards or against something; a push, a strike.
• appulsionA driving or striking against; an appulse.
• apricateTo bask in the sun.
• apriciousSunny; warmed by or basking in the sun.
• apricityThe light or warmth of the Sun.
• aprimorateTo raise (something) to a better state; to elevate, to improve, to refine.
• aptitudinalRelating to aptitude.
• aptoteA noun (broadly speaking) which has no distinction of cases; an indeclinable noun.
• aqua fortisA corrosive liquor made of saltpeter, serving as a solvent for dissolving silver and all other metals except gold.
• aqua mirabilisA drink prepared from cloves, nutmeg, ginger, and spirit of wine.
• aquaphiliaA sexual attraction to general imagery of people in water, sexual acts in water, or watery environments.
• aqua regiaA mixture of three parts concentrated hydrochloric acid to one part concentrated nitric acid, named for its ability to dissolve gold.
• AquaterraCollectively, all the submerged lands that were once above water in ice age glacial periods, since the start of the Pleistocene.
• aquatileInhabiting the water.
• aquatoneAn offset printing method using a gelatin-coated zinc plate to print type, line illustrations, and fine-screen halftones.
• aquicludeA solid, impermeable area underlying or overlying an aquifer.
• aquila albacalomel, or various other substances
• AquilonThe Roman god of the North Wind, equivalent to the Greek god Boreas.
• aquitardA semipermeable layer along an aquifer.
• aquosewatery; aqueous
• -arOf, near, or pertaining to; adjective suffix appended to various words, often nouns, to make an adjective form. Often added to words of Latin origin, but used with other words also.
• ar-Forming classification names for classes of organic compounds that contain a carbon skeleton and one or more aromatic rings.
• arachibutyrophobiaFear of peanut butter sticking to the roof of one's mouth.
• arachidicOf or pertaining to arachidic acid or its derivatives.
• ArachosiaAn ancient Achaemenid and Seleucid satrapy in the eastern part of their respective empires, around modern-day southern Afghanistan.
• araeostyleA type of intercolumniation
• araeosystyleAn arrangement of columns that alternates between araeostyle and systyle.
• AramaismAn idiom from the Aramaic language.
• ArameaSynonym of Aram
• araneousExtremely thin and delicate, like a cobweb.
• ArbacesThe first king of Media according to Ctesias
• arbiter elegantiaeAn arbiter of good taste or proper behavior.
• arbiter elegantiarumAn authority on manners or etiquette.
• arbitratrixA female arbitrator.
• arbitrixA female arbiter, an arbitress.
• arboraryOf or pertaining to trees; arboreal.
• arboreousHaving the characteristics of a tree. (of a plant)
• arboresceTo become a tree or tree-like, branching.
• arboricityThe minimum number of forests into which the edges of an undirected graph may be partitioned.
• arboriformResembling a tree in shape or appearance.
• arborolSynonym of dendrimer.
• arborolatryThe worship of trees.
• arbuscleA plant midway in height between a shrub and a tree; a dwarf tree.
• arbustivecontaining copses of trees or shrubs; covered with shrubs
• arc-Used to form the names of inverse trigonometric functions, and the symbols for these functions.
• archangelicOf, relating to, resembling, or characteristic of archangels.
• ArchebulusAn ancient Greek poet
• ArchemachusAn ancient Greek historian
• archidiaconalPertaining to an archdeacon.
• ArchilochianOf or pertaining to the Ancient Greek satirical poet Archilochus and his style.
• archisynagogueThe head of a synagogue.
• archontologyThe study of historical offices and the people who held them.
• arciformHaving the form of a bow (weapon)
• arcographAn instrument for drawing a circular arc without using a central point.
• arcosoliumA tomb in an arched recess in a wall.
• arctationStenosis.
• arcuationThe act of bending or curving; the state of being bent; crookedness.
• arcubalisterA crossbowman; one who used the arcubalist.
• arculusA crossvein between the radius and cubitus near the base of the wing in certain insects
• arduityThe state or quality of being arduous; steepness, difficulty.
• arefactionThe fact or process of drying; desiccation.
• arefyTo dry, or make dry; wither.
• arenaceousSandy; characterised by sand.
• arenarioussandy
• arenationA form of therapeutic bathing in hot sand.
• arenicoliteA wormhole or other burrowing tunnel preserved in sandstone or another rock.
• arenicolousLiving or burrowing in sand.
• areniformof or resembling sand
• areniliticOf or pertaining to sandstone.
• areniteAny sedimentary rock with a grain size in the sand range on the Wentworth scale.
• areno-sand
• arenosesandy, gritty, full of sand.
• arenulousContaining or resembling sand.
• areoletA small space on the wings of insects, circumscribed by the radii.
• AreopagiticOf or pertaining to the Areopagus (council of ancient Athens).
• AreopagiticsCollectively, the mystical theological works attributed to Pseudo-Dionysius the Areopagite.
• argalthus, therefore
• argalaThe greater adjutant, a stork native to Africa, India, and Southeast Asia.
• argentaliumAn alloy of aluminium and silver.
• argentamineA solution of silver phosphate in an aqueous solution of ethylene diamine, used as an antiseptic astringent and as a disinfectant.
• argentatesilvery white
• argenteousSilvery.
• argentousOf, pertaining to, or containing silver.
• argillicOf or pertaining to clay or clay minerals.
• argilliferousProducing clay; rich in argil.
• argilliturbationA mixing process in clay rich soils subjected to cycles of wet and dry, whereby the soil expands when wet and contracts as it dries, causing soil, stones and artefacts to move up and down.
• argillousclayey; argillaceous
• ArgolicRelating to Argolis (various subdivisions which such name) in the Peloponnesus.
• argonauticOf or pertaining to the Argonauts.
• Argo NavisA former constellation of the southern sky, said to represent the mythical ship Argo. In 1763, it was divided into the three new constellations: Carina (keel), Puppis (stern), and Vela (sail).
• argumentableAdmitting of argument; arguable.
• argumentum ad baculumThe use or threat of force to coerce acceptance of an argument.
• argumentum ad consequentiamA logical fallacy in which a statement is determined to be true or false based on whether it would be pleasant or desirable, rather than based on reality.
• argumentum ad dictionariumAn argument citing a dictionary definition as the proper and correct usage, and claiming that an excluded usage must be incorrect.
• argumentum ad hominemA type of fallacious argument in which the attempt is made to refute a theory or belief by discrediting the person(s) who advocate that theory or belief; an ad hominem argument.
• argumentum ad ignorantiamA fallacious argument asserting that a proposition is true because it has not yet been proven false, or vice versa.
• argumentum baculinumThe use of physical force to win an argument.
• argutationnitpicking; arguing about trivialities