12-letter words containing a, c, e, s, o
- antichthones — the antipodes
- anticonsumer — opposed to consumerism
- anticyclones — Plural form of anticyclone.
- antinucleons — Plural form of antinucleon.
- antisociable — Antisocial.
- apocynaceous — of, relating to, or belonging to the Apocynaceae, a family of mostly tropical flowering plants with latex in their stems, including the dogbane, periwinkle, oleander, and some lianas
- apothecaries — Plural form of apothecary.
- appreciators — to be grateful or thankful for: They appreciated his thoughtfulness.
- arborescence — treelike in size and form.
- arc cosecant — the angle, measured in radians, that has a cosecant equal to a given number. Symbol: csc −1. Abbreviation: arc csc;
- archdiocesan — Relating to an archdiocese.
- archdioceses — Plural form of archdiocese.
- archenterons — Plural form of archenteron.
- archeologist — archaeology.
- archesporial — the primitive cell, or group of cells, that give rise to the cells from which spores are derived.
- archesporium — archespore.
- archibenthos — the ocean bottom between the littoral and abyssal zones: from depths of approximately 200 feet (60 meters) to 3300 feet (1000 meters).
- archipelagos — Plural form of archipelago.
- argillaceous — (of sedimentary rocks and deposits) composed of very fine-grained material, such as clay, shale, etc
- armed forces — The armed forces or the armed services of a country are its military forces, usually the army, navy, marines, and air force.
- arthroscopes — Plural form of arthroscope.
- ascensionist — a person who has completed a mountain ascent, esp a notable one
- ascomycetous — belonging or pertaining to the Ascomycota.
- ash-coloured — silver-grey in colour
- aspect ratio — the ratio of width to height of the picture on a television or cinema screen
- assay office — an organization that assays and monitors the purity of precious metals in a particular country
- assuefaction — the condition of being or becoming familiar with or used to something
- astigmoscope — astigmatoscope.
- astrochemist — (chemistry, astronomy) A chemist or astronomer whose speciality is astrochemistry.
- asynchronies — a lack of synchronism or coincidence in time.
- atactostelic — Of or possessing an atactostele.
- atmospherics — Atmospherics are elements in something such as a piece of music or a book which create a certain atmosphere.
- auction sale — an instance of items being sold by auction
- auction site — a commercial website on which items are sold by internet auction
- autocatalyse — to cause an internal, self-produced, chemical reaction
- autochangers — Plural form of autochanger.
- autochthones — Alternative spelling of autochthons.
- autodestruct — likely to or possessing the power to destroy or obliterate itself or its possessor
- autoeciously — in an autoecious manner
- autotheistic — Self-worshiping; prideful in the extreme.
- axiom schema — (logic) A formula in the language of an axiomatic system, containing one or more. These metasyntactic variables (or "schematic variables") that stand for terms or subformulae. An example is the Axiom of Comprehension.
- babcock test — a test for determining the butterfat content of milk and milk products, conducted by adding sulfuric acid to a sample and then centrifuging it in a flask with a calibrated neck in which the liquefied fat collects.
- bachelorship — the state of being a bachelor; bachelorhood
- back-stopped — a wall, wire screen, or the like, serving to prevent a ball from going too far beyond the normal playing area.
- backboneless — lacking backbone; cowardly
- backwoodsmen — Plural form of backwoodsman.
- bacon-slicer — a machine for cutting bacon into slices
- bacteriostat — any substance that arrests the growth or reproduction of bacteria but does not kill them
- balsamaceous — any of various fragrant exudations from certain trees, especially trees of the genus Commiphora, as balm-of-Gilead. Compare balm (def 1).
- barge course — the overhang of the gable end of a roof