12-letter words containing a, c, t, e, r
- archibenthos — the ocean bottom between the littoral and abyssal zones: from depths of approximately 200 feet (60 meters) to 3300 feet (1000 meters).
- architecting — a person who engages in the profession of architecture.
- architecture — Architecture is the art of planning, designing, and constructing buildings.
- archive site — (networking) (Or "FTP site", "FTP archive") An Internet host where program source, documents, e-mail or news messages are stored for public access via anonymous FTP, Gopher, web or other document distribution system. There may be several archive sites (mirrors) for, e.g., a Usenet newsgroup though one may be recognised as the main one. FTP servers were common on the Internet for about ten years but have been largely replaced by web servers since the invention of the World-Wide Web and its HTTP protocol. Some well-known archive sites included Imperial College, UK, UUNET, USA, GNU archive site. The archie service attempted to index the contents of FTP archives, foreshadowing the indexing of the web by Google and others.
- arctic ocean — the ocean surrounding the North Pole, north of the Arctic Circle. Area: about 14 100 000 sq km (5 440 000 sq miles)
- arithmetical — Arithmetical calculations, processes, or skills involve the addition, subtraction, multiplication, or division of numbers.
- armada chest — an iron or iron-bound strongbox of the 17th or 18th century.
- arming chest — a chest for holding armor and weapons.
- art director — a person responsible for the sets and costumes in a film
- arthrobacter — a genus of rod-shaped or spherical bacteria found in the soil.
- arthroscopes — Plural form of arthroscope.
- articulately — uttered clearly in distinct syllables.
- articulative — relating to articulation
- artiodactyle — (zoology) One of the Artiodactyla, a group of ungulates.
- ascertaining — to find out definitely; learn with certainty or assurance; determine: to ascertain the facts.
- aspect ratio — the ratio of width to height of the picture on a television or cinema screen
- astrochemist — (chemistry, astronomy) A chemist or astronomer whose speciality is astrochemistry.
- asymmetrical — Something that is asymmetrical has two sides or halves that are different in shape, size, or style.
- at a stretch — with some difficulty; by making a special effort
- at any price — If you want something at any price, you are determined to get it, even if unpleasant things happen as a result.
- atheoretical — having no connection with and not founded on theory
- atmospherics — Atmospherics are elements in something such as a piece of music or a book which create a certain atmosphere.
- atomic power — nuclear power.
- attractively — In an attractive manner; with the power of attracting or drawing to.
- au contraire — on the contrary
- auctioneered — Simple past tense and past participle of auctioneer.
- auger effect — the spontaneous emission of an electron instead of a photon by an excited ion as a result of a vacancy being filled in an inner electron shell
- autochangers — Plural form of autochanger.
- autocritique — the examination of factors guiding one's thoughts, beliefs and actions; self-criticism
- autodestruct — likely to or possessing the power to destroy or obliterate itself or its possessor
- autoinjector — A medical device designed to deliver a single dose of a particular, typically life-saving, drug.
- autoreactive — (immunology, medicine) Acting against the organism by which it was produced.
- averruncator — a long pair of shears used for pruning the higher branches of trees
- awe-stricken — filled with awe.
- axisymmetric — being symmetrical around an axis
- b-s particle — a neutral meson with a mass 10,507 times that of the electron and a mean lifetime of approximately 1.6 X 10 -12 seconds.
- baccalauréat — (esp in France) a school-leaving examination that qualifies the successful candidates for entrance to university
- bach trumpet — a modern small three-valved trumpet for playing clarino passages in Bach's music
- bachelorette — A bachelorette is a woman who has never married.
- back scatter — the deflection of nuclear particles or of radiation in a scattering process through an angle greater than 90°.
- back stretch — the straight part of a race track opposite the part leading to the finish line.
- backtrackers — Plural form of backtracker.
- bacteria bed — a layer of sand or gravel used to expose sewage effluent, in its final stages, to air and the action of microorganisms
- bactericidal — any substance capable of killing bacteria.
- bactericides — Plural form of bactericide.
- bacteriocide — Alternative form of bactericide.
- bacteriology — Bacteriology is the science and the study of bacteria.
- bacteriostat — any substance that arrests the growth or reproduction of bacteria but does not kill them
- bag snatcher — a thief whose main tactic is to grab women's handbags and run off with them
- baluchithere — a hornless rhinoceros of the extinct genus Baluchitherium that inhabited central Asia during the Oligocene and early Miocene epochs: the largest land mammal known.