12-letter words containing a, c, o, y
- 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
- apolitically — in an apolitical manner
- apostolicity — the quality of being apostolic
- appendectomy — the surgical removal of the vermiform appendix
- appreciatory — appreciative.
- archaeometry — the use of science and modern technology in archaeology to examine and interpret archaeological remains
- archdeaconry — the office, rank, or duties of an archdeacon
- 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.
- 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.
- 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.
- aschoff body — any of the spindleshaped nodules found in heart tissue and associated with the myocarditis of rheumatic fever.
- ascomycetous — belonging or pertaining to the Ascomycota.
- assay office — an organization that assays and monitors the purity of precious metals in a particular country
- astrocytomas — Plural form of astrocytoma.
- astrodynamic — Pertaining to astrodynamics.
- astrophysics — Astrophysics is the study of the physical and chemical structure of the stars, planets, and other natural objects in space.
- asymptomatic — If someone with a disease is asymptomatic, it means that they do not show any symptoms of the disease.
- asymptotical — of or relating to an asymptote.
- asynchronies — a lack of synchronism or coincidence in time.
- asynchronism — a lack of synchronism; occurrence at different times
- asynchronous — An asynchronous electric machine is one in which the magnetic field and the rotation are not exactly the same.
- athrocytosis — the capability of a cell to receive and store matter
- atychiphobia — (rare) The fear of failure.
- auspiciously — promising success; propitious; opportune; favorable: an auspicious occasion.
- autocatalyse — to cause an internal, self-produced, chemical reaction
- autocatalyze — To cause, or to undergo autocatalysis.
- autoeciously — in an autoecious manner
- autohypnotic — Of or pertaining to autohypnosis; self-hypnotizing.
- automaticity — the condition of being automatic, or the degree of this
- autoptically — in an autoptical manner
- autorhythmic — That generates its own rhythm.
- avariciously — characterized by avarice; greedy; covetous.
- azithromycin — A macrolide antibiotic derived from erythromycin.
- baby-bouncer — a seat on springs suspended from a door frame, etc, in which a baby may be placed for exercise
- back country — The back country is an area that is a long way from any city and has very few people living in it.
- backroom boy — You can refer to a man as a backroom boy when he does important work in an organization and has good ideas but is not seen or known about by the public.
- bacteriology — Bacteriology is the science and the study of bacteria.
- barodynamics — the branch of mechanics concerned with heavy structures
- beyond reach — inaccessible
- binary color — secondary color.
- binocularity — binocular characteristics
- biologically — pertaining to biology.
- black bryony — a climbing herbaceous Eurasian plant, Tamus communis, having small greenish flowers and poisonous red berries: family Dioscoreaceae
- black canyon — a canyon of the Colorado River between Arizona and Nevada: site of Boulder Dam.
- black comedy — a comedy dealing with an unpleasant situation in a pessimistic or macabre manner