12-letter words containing c, o, a
- apagogically — in an apagogical manner
- apalachicola — river in NW Fla., flowing from the Fla.-Ga. border southward into the Gulf of Mexico: 90 mi (145 km)
- aperiodicity — not periodic; irregular.
- aphoristical — Alternative form of aphoristic.
- aphrodisiacs — Plural form of aphrodisiac.
- apicomplexan — Describing protists of the phylum Apicomplexa.
- aplacophoran — solenogaster.
- apocalyptist — the writer of the Apocalypse or a related work
- apochromatic — (of a lens) almost free from spherical and chromatic aberration
- apocryphally — In an apocryphal manner.
- 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
- apodeictical — Apodeictic.
- apolitically — in an apolitical manner
- apostolicity — the quality of being apostolic
- apothecaries — Plural form of apothecary.
- apothegmatic — Relating to, or in the manner of, an apothegm; sententious; pithy.
- appeal court — An appeal court is the same as a Court of Appeal.
- appendectomy — the surgical removal of the vermiform appendix
- apperception — the attainment of full awareness of a sensation or idea
- appleknocker — Northern U.S. a rustic.
- 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.
- approachable — If you describe someone as approachable, you think that they are friendly and easy to talk to.
- approachment — (archaic) approach.
- apricot tart — a pastry case filled with apricots
- arachnophobe — a person who is afraid of spiders
- arborescence — treelike in size and form.
- arborio rice — variety of round-grain rice used for making risotto
- arc cosecant — the angle, measured in radians, that has a cosecant equal to a given number. Symbol: csc −1. Abbreviation: arc csc;
- arch support — a rigid support placed inside a shoe so that its molded form fits the arch of the foot and relieves strain on the muscles of the foot while walking, standing, etc.
- archaeologic — Pertaining to archaeology.
- archaeometry — the use of science and modern technology in archaeology to examine and interpret archaeological remains
- 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.
- 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