12-letter words containing a, c, o, i
- apperception — the attainment of full awareness of a sensation or idea
- applications — Plural form of application.
- appreciation — Appreciation of something is the recognition and enjoyment of its good qualities.
- appreciators — to be grateful or thankful for: They appreciated his thoughtfulness.
- appreciatory — appreciative.
- apricot tart — a pastry case filled with apricots
- arborio rice — variety of round-grain rice used for making risotto
- archaeologic — Pertaining to archaeology.
- archaic homo — collectively, the very robust, regionally differentiated human populations that lived in Europe, Asia, the Middle East, and Africa from 35,000 to 200,000 years ago.
- archaization — Process of becoming or turning something more archaic.
- archdiocesan — Relating to an archdiocese.
- archdioceses — Plural form of archdiocese.
- archegoniate — having archegonia
- 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).
- 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.
- 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.
- art director — a person responsible for the sets and costumes in a film
- arthropathic — disease of the joints.
- 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
- ascensionist — a person who has completed a mountain ascent, esp a notable one
- 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
- associations — Plural form of association.
- assuefaction — the condition of being or becoming familiar with or used to something
- astacologist — a person who investigates and analyses crayfish
- astigmoscope — astigmatoscope.
- astrochemist — (chemistry, astronomy) A chemist or astronomer whose speciality is astrochemistry.
- 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