12-letter words containing c, o, r, a
- archaization — Process of becoming or turning something more archaic.
- archdeaconry — the office, rank, or duties of an archdeacon
- archdiocesan — Relating to an archdiocese.
- archdioceses — Plural form of archdiocese.
- archegoniate — having archegonia
- archenterons — Plural form of archenteron.
- archeologist — archaeology.
- archeopteryx — A specimen of the species Archaeopteryx lithographica, being the earliest and most primitive known bird, representing a transition in the evolution of dinosaurs to birds.
- 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).
- archilochian — denoting or relating to the 7th century bc Greek poet Archilochus or his verse, esp the iambic trimeters or trochaic tetrameters used by him
- archipelagos — Plural form of archipelago.
- archiphoneme — an abstract linguistic unit representing two or more phonemes when the distinction between these has been neutralized: conventionally shown by a capital letter within slashes, as /T/ for /t/ and /d/ in German Rat and Rad
- archosaurian — belonging to or characteristic of the archosaurs
- 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)
- arctophilist — a collector of teddy bears
- argillaceous — (of sedimentary rocks and deposits) composed of very fine-grained material, such as clay, shale, etc
- aria da capo — an operatic aria in three sections with the first and third sections alike and the middle section contrasting.
- aristocratic — Aristocratic means belonging to or typical of the aristocracy.
- aristolochia — any of various plants of the genus Aristolochia of the family Aristolochiaceae
- aristophanic — 448?–385? b.c, Athenian comic dramatist.
- armed forces — The armed forces or the armed services of a country are its military forces, usually the army, navy, marines, and air force.
- armoured car — a fast lightly armed and armoured vehicle, mainly used for reconnaissance
- arms control — an agreement between two or more countries to reduce the number of weapons owned, with the aim of preventing war
- army cutworm — the larva of a noctuid moth, Chorizagrotis auxiliaris, that is a pest of wheat and alfalfa in the Plains states.
- army officer — a person in the army who holds a position of authority, responsibility and duty, especially one who holds a commission
- aromatically — having an aroma; fragrant or sweet-scented; odoriferous.
- arson attack — an attack when property is set fire to
- 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.
- arthropathic — disease of the joints.
- arthroscopes — Plural form of arthroscope.
- arthroscopic — the use of an arthroscope to diagnose an injury to or disease of a joint or to perform minor surgery on a joint.
- articulation — Articulation is the action of producing a sound or word clearly, in speech or music.
- articulators — Plural form of articulator.
- articulatory — an act or the process of articulating: the articulation of a form; the articulation of a new thought.
- artiodactyle — (zoology) One of the Artiodactyla, a group of ungulates.
- artiodactyls — Plural form of artiodactyl.
- arts council — an organization that provides funding for a variety of arts activities
- ash-coloured — silver-grey in colour
- aspect ratio — the ratio of width to height of the picture on a television or cinema screen
- asphalt rock — a rock formation, usually of limestone or sandstone, containing large amounts of bitumens.
- astrochemist — (chemistry, astronomy) A chemist or astronomer whose speciality is astrochemistry.
- astrocompass — a navigational instrument for giving directional bearings from the centre of the earth to a particular star. It is carried in long-range aircraft, ships, spacecraft, etc
- astrocytomas — Plural form of astrocytoma.
- astrodynamic — Pertaining to astrodynamics.
- astrological — the study that assumes and attempts to interpret the influence of the heavenly bodies on human affairs.
- astronautics — the science and technology of space flight
- astronomical — If you describe an amount, especially the cost of something as astronomical, you are emphasizing that it is very large indeed.