16-letter words containing a, s, t, o
- apostolic church — the Christian church as founded by the apostles.
- appraisal method — a method used for the appraisal of an employee
- aratus of sicyon — 271–213 b.c, Greek general: leader of the Achaean League.
- archaeoastronomy — the scientific study of the beliefs and practices concerning astronomy that existed in ancient and prehistoric civilizations
- archaeomagnetism — an archaeological technique for dating certain clay objects by measuring the extent to which they have been magnetized by the earth's magnetic field
- archconservative — consistently holding extremely conservative views: publisher of the city's archconservative newspaper.
- archival storage — a method of retaining information outside of the internal memory of a computer
- aristocratically — In an aristocratic manner.
- arsenic trioxide — a white poisonous powder used in the manufacture of glass and as an insecticide, rat poison, and weedkiller. Formula: As2O3
- arteriosclerosis — Arteriosclerosis is a medical condition in which the walls of your arteries become hard and thick, so your blood cannot flow through them properly.
- arteriosclerotic — degenerative changes in the arteries, characterized by thickening of the vessel walls and accumulation of calcium with consequent loss of elasticity and lessened blood flow.
- arthroscopically — By means of arthroscopy.
- arthus' reaction — a severe, local immune reaction to the injection of an antigen in a sensitized host.
- as a last resort — If you do something as a last resort, you do it because you can find no other way of getting out of a difficult situation or of solving a problem.
- as distinct from — If you say that you are talking about one thing as distinct from another, you are indicating exactly which thing you mean.
- as is one's wont — If someone does a particular thing as is their wont, they do that thing often or regularly.
- as likely as not — very probably
- ascidian tadpole — the free-swimming larva of an ascidian, having a tadpole-like tail containing the notochord and nerve cord
- assembly routine — assembler (def 2a).
- assimilationists — Plural form of assimilationist.
- assistant editor — a person who assists an editor in their work
- associate degree — An associate degree is a college degree that is awarded to a student who has completed a two-year course of study.
- associate member — a person who is a member of a club, organization etc. but has only partial rights and privileges or subordinate status
- associated state — a nation with limited sovereignty, especially a former colony that now assumes responsibility for domestic affairs but continues to depend on the colonial ruler for defense and foreign policy.
- association area — any of the regions of the cerebral cortex of the brain connected by numerous nerve fibers to all parts of both cerebral hemispheres and coordinating such higher activities as learning and reasoning.
- associationistic — Of or pertaining to associationism.
- aston dark space — the dark region between the cathode and the cathode glow in a vacuum tube, occurring when the pressure is low.
- astroarchaeology — archaeoastronomy.
- astroengineering — (scifi) The construction of megastructures in space by technologically advanced beings.
- astrometeorology — the study of the theoretical effects of astronomical bodies and forces on the earth's atmosphere.
- astronomer royal — an honorary title awarded to an eminent British astronomer: until 1972, the Astronomer Royal was also director of the Royal Greenwich Observatory
- astrophotography — the photography of celestial bodies used in astronomy
- asymptomatically — showing no evidence of disease.
- at one's leisure — when one has free time
- atmospheric tide — a movement of atmospheric masses caused by the gravitational attraction of the sun and moon and by daily solar heating.
- atomic mass unit — a unit of mass used to express atomic and molecular weights that is equal to one twelfth of the mass of an atom of carbon-12. It is equivalent to 1.66 × 10–27 kg
- atomic physicist — a scientist specializing in atomic physics
- atomic structure — the concept of an atom as a central positively charged nucleus consisting of protons and neutrons surrounded by a number of electrons. The number of electrons is equal to the number of protons: the whole entity is thus electrically neutral
- atwood's machine — a device consisting of two unequal masses connected by a string passed over a pulley, used to illustrate the laws of motion.
- auditory aphasia — aphasia in which there is no comprehension of spoken words; word deafness.
- auditory vesicle — the pouch that is formed by the invagination of an ectodermal placode and that develops into the internal ear.
- aurora australis — the aurora seen around the South Pole
- australopithecus — an extinct genus of small-brained,large-toothed bipedal hominids that lived in Africa between one and four million years ago.
- austro-hungarian — of or relating to the Dual Monarchy of Austria-Hungary (1867–1918)
- authoritarianism — Authoritarianism is the state of being authoritarian or the belief that people with power, especially the State, have the right to control other people's actions.
- autofluorescence — (biology, microscopy) Self-induced fluorescence.
- automatic pistol — a type of pistol having a mechanism that throws out the empty shell, puts in a new one, and prepares the pistol to be fired again.
- autoregressively — In an autoregressive manner.
- autostereoscopic — Of or pertaining to autostereoscopy.
- autotransformers — Plural form of autotransformer.