| archduchess | (noun) a wife or widow of an archduke or a princess of the former ruling house of Austria | - |
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| archduchy | (noun) the domain controlled by an archduke or archduchess | - |
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| archduke | (noun) a sovereign prince of the former ruling house of Austria | - |
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| archean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archaean |
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| arched | (adjective) constructed with or in the form of an arch or arches | - |
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| (adjective) forming or resembling an arch | Synonyms: arced, arching, arciform, arcuate, bowed |
| archegonial | (adjective) of or relating to an archegonium | Synonyms: archegoniate |
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| archegoniate | (adjective) of or relating to an archegonium | Synonyms: archegonial |
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| archegonium | (noun) a female sex organ occurring in mosses, ferns, and most gymnosperms | - |
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| archenteron | (noun) central cavity of the gastrula; becomes the intestinal or digestive cavity | - |
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| archeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archaeobacteria |
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| archeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeological |
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| archeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeologic |
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| archeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archaeologist |
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| archeology | (noun) the branch of anthropology that studies prehistoric people and their cultures | Synonyms: archaeology |
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| archeopteryx | (noun) extinct primitive toothed bird of the Jurassic period having a long feathered tail and hollow bones; usually considered the most primitive of all birds | Synonyms: archaeopteryx, Archaeopteryx lithographica |
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| archeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archaeozoic |
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| archepiscopal | (adjective) of or associated with an archbishop | Synonyms: archiepiscopal |
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| archer | (noun) a person who is expert in the use of a bow and arrow | Synonyms: bowman |
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| archerfish | (noun) any of several small freshwater fishes that catch insects by squirting water at them and knocking them into the water; found in Indonesia and Australia | Synonyms: Toxotes jaculatrix |
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| archery | (noun) the sport of shooting arrows with a bow | - |
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| archespore | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archesporium |
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| archesporial | (adjective) of or relating to the cells in a sporangium that give rise to spores | - |
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| archesporium | (noun) primitive cell or group of cells from which a mother cell develops | Synonyms: archespore |
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| archetypal | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypical, prototypal, prototypic, prototypical |
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| archetype | (noun) something that serves as a model or a basis for making copies | Synonyms: original, pilot |
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| archetypical | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, prototypal, prototypic, prototypical |
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| archiannelid | (noun) small primitive marine worm lacking external segmentation and resembling polychaete larvae | - |
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| archidiaconal | (adjective) of or relating to an archdeacon or his office | - |
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| archidiaconate | (noun) office or position of an archdeacon | - |
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| archiepiscopal | (adjective) of or associated with an archbishop | Synonyms: archepiscopal |
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| archil | (noun) any of various lecanoras that yield the dye archil | Synonyms: orchil |
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| (noun) a purplish dye obtained from orchil lichens | Synonyms: cudbear, orchil |
| archimandrite | (noun) the superior of an abbey of monks | Synonyms: abbot |
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| archine | (noun) a Russian unit of length (71 cm) | - |
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| arching | (adjective) forming or resembling an arch | Synonyms: arced, arched, arciform, arcuate, bowed |
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| archipallium | (noun) the olfactory cortex of the cerebrum | Synonyms: paleocortex |
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| archipelagic | (adjective) relating to or part of an archipelago | - |
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| archipelago | (noun) a group of many islands in a large body of water | - |
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| architect | (noun) someone who creates plans to be used in making something (such as buildings) | Synonyms: designer |
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| architectonic | (adjective) of or pertaining to construction or architecture | Synonyms: tectonic |
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| architectonics | (noun) the science of architecture | Synonyms: tectonics |
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| architectural | (adjective) of or pertaining to the art and science of architecture | - |
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| architecturally | (adverb) with regard to architecture | - |
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| architecture | (noun) the profession of designing buildings and environments with consideration for their esthetic effect | - |
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| (noun) an architectural product or work | - |
| (noun) (computer science) the structure and organization of a computer's hardware or system software | Synonyms: computer architecture |
| (noun) the discipline dealing with the principles of design and construction and ornamentation of fine buildings | - |
| architeuthis | (noun) largest mollusk known about but never seen (to 60 feet long) | Synonyms: giant squid |
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| architrave | (noun) the lowest part of an entablature; rests immediately on the capitals of the columns | - |
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| (noun) the molding around a door or window | - |
| archival | (adjective) of or relating to or contained in or serving as an archive | - |
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| archive | (noun) a depository containing historical records and documents | - |
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| (verb) put into an archive | Synonyms: file away |
| archives | (noun) collection of records especially about an institution | - |
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| archivist | (noun) a person in charge of collecting and cataloguing archives | - |
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| archly | (adverb) in an arch manner; with playful slyness or roguishness | - |
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| archness | (noun) inappropriate playfulness | Synonyms: impertinence, perkiness, pertness, sauciness |
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| archosaur | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaurian, archosaurian reptile |
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| archosaurian | (adjective) of or relating to reptiles of the subclass Archosauria | - |
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| (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
| archpriest | (noun) a senior clergyman and dignitary | Synonyms: hierarch, high priest, prelate, primate |
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| archway | (noun) a passageway under a curved masonry construction | Synonyms: arch |
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| arciform | (adjective) forming or resembling an arch | Synonyms: arced, arched, arching, arcuate, bowed |
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| arcminute | (noun) a unit of angular distance equal to a 60th of a degree | Synonyms: minute, minute of arc |
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| arco | (adjective) (of instruments in the violin family) to be played with the bow | - |
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| arcsec | (noun) the inverse function of the secant; the angle that has a secant equal to a given number | Synonyms: arc secant, arcsecant, inverse secant |
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| arcsecant | (noun) the inverse function of the secant; the angle that has a secant equal to a given number | Synonyms: arc secant, arcsec, inverse secant |
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| arcsecond | (noun) a 60th part of a minute of arc | Synonyms: second |
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| arcsin | (noun) the inverse function of the sine; the angle that has a sine equal to a given number | Synonyms: arc sine, arcsine, inverse sine |
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| arcsine | (noun) the inverse function of the sine; the angle that has a sine equal to a given number | Synonyms: arc sine, arcsin, inverse sine |
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| arctan | (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number | Synonyms: arc tangent, arctangent, inverse tangent |
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| arctangent | (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number | Synonyms: arc tangent, arctan, inverse tangent |
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| arctic | (adjective) extremely cold | Synonyms: frigid, gelid, glacial, icy, polar |
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| (noun) a waterproof overshoe that protects shoes from water or snow | Synonyms: galosh, golosh, gumshoe, rubber |
| arctiid | (noun) stout-bodied broad-winged moth with conspicuously striped or spotted wings; larvae are hairy caterpillars | Synonyms: arctiid moth |
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| arcuate | (adjective) forming or resembling an arch | Synonyms: arced, arched, arching, arciform, bowed |
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| arcus | (noun) a whitish deposit in the shape of an arc that is sometimes seen in the cornea | Synonyms: arcus senilis |
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| ard | (noun) a simple light plough without a mouldboard. | Synonyms: ard plough, scratch plough |
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| ardeb | (noun) a unit of dry measure used in Egypt | - |
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| ardent | (adjective) glowing or shining like fire | - |
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| (adjective) characterized by strong enthusiasm | Synonyms: warm |
| (adjective) characterized by intense emotion | Synonyms: fervent, fervid, fiery, impassioned, perfervid, torrid |
| ardently | (adverb) in an ardent manner | - |
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| ardor | (noun) intense feeling of love | Synonyms: ardour |
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| (noun) a feeling of strong eagerness (usually in favor of a person or cause) | Synonyms: ardour, elan, zeal |
| (noun) feelings of great warmth and intensity | Synonyms: ardour, fervency, fervidness, fervor, fervour, fire |
| ardour | (noun) intense feeling of love | Synonyms: ardor |
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| (noun) a feeling of strong eagerness (usually in favor of a person or cause) | Synonyms: ardor, elan, zeal |
| (noun) feelings of great warmth and intensity | Synonyms: ardor, fervency, fervidness, fervor, fervour, fire |
| arduous | (adjective) difficult to accomplish; demanding considerable mental effort and skill | - |
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| (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: backbreaking, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome |
| (adjective) taxing to the utmost; testing powers of endurance | Synonyms: straining, strenuous |
| arduously | (adverb) in an arduous manner | - |
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| arduousness | (noun) extreme effortfulness | Synonyms: strenuousness |
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| are | (noun) a unit of surface area equal to 100 square meters | Synonyms: ar |
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| area | (noun) a part of a structure having some specific characteristic or function | - |
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| (noun) the extent of a 2-dimensional surface enclosed within a boundary | Synonyms: expanse, surface area |
| (noun) a part of an animal that has a special function or is supplied by a given artery or nerve | Synonyms: region |
| (noun) a subject of study | - |
| (noun) a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography) | Synonyms: country |
| (noun) a particular environment or walk of life | Synonyms: arena, domain, field, orbit, sphere |
| areal | (adjective) of or relating to or involving an area | - |
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| areaway | (noun) a passageway between buildings or giving access to a basement | - |
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| areca | (noun) any of several tall tropical palms native to southeastern Asia having egg-shaped nuts | - |
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| areflexia | (noun) absence of a reflex; a sign of possible nerve damage | - |
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| arena | (noun) a playing field where sports events take place | Synonyms: scene of action |
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| (noun) a large structure for open-air sports or entertainments | Synonyms: bowl, sports stadium, stadium |
| (noun) the central area of an ancient Roman amphitheater where contests and spectacles were held; especially an area that was strewn with sand | - |
| (noun) a particular environment or walk of life | Synonyms: area, domain, field, orbit, sphere |
| arenaceous | (adjective) resembling or containing or abounding in sand; or growing in sandy areas | Synonyms: sandlike, sandy |
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| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| arenicolous | (adjective) growing or living or burrowing in sand | - |
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| areola | (noun) small circular area such as that around the human nipple or an inflamed area around a pimple or insect bite | Synonyms: ring of color |
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| (noun) small space in a tissue or body part such as the area between veins on a leaf or an insect's wing | - |
| areolar | (adjective) relating to or like or divided into areolae | Synonyms: areolate |
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| areolate | (adjective) relating to or like or divided into areolae | Synonyms: areolar |
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| arere | (noun) large west African tree having large palmately lobed leaves and axillary cymose panicles of small white flowers and one-winged seeds; yields soft white to pale yellow wood | Synonyms: obeche, obechi, samba, Triplochiton scleroxcylon |
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| arete | (noun) a sharp narrow ridge found in rugged mountains | - |
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| arethusa | (noun) any of several bog orchids of the genus Arethusa having 1 or 2 showy flowers | - |
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| argal | (noun) wild sheep of semidesert regions in central Asia | Synonyms: argali, Ovis ammon |
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| argali | (noun) wild sheep of semidesert regions in central Asia | Synonyms: argal, Ovis ammon |
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| argasid | (noun) tick lacking a dorsal shield and having mouth parts on the under side of the head | Synonyms: soft tick |
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| argemone | (noun) any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America | Synonyms: devil's fig, prickly poppy, white thistle |
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| argent | (adjective) of lustrous grey; covered with or tinged with the color of silver | Synonyms: silver, silverish, silvery |
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| (noun) a metal tincture used in heraldry to give a silvery appearance | - |
| argentic | (adjective) relating to compounds in which silver is bivalent | - |
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