11-letter words containing a, r, o, n
- arachnology — the study of arachnids
- arakan yoma — a mountain range in Myanmar, between the Irrawaddy River and the W coast: forms a barrier between Myanmar and India; teak forests
- araneomorph — (zoology) Any of the Araneomorphae, a suborder of spiders whose fangs cross with a pinching action.
- arbitration — Arbitration is the judging of a dispute between people or groups by someone who is not involved.
- arborescent — having the shape or characteristics of a tree
- arc-boutant — flying buttress.
- archaeornis — an extinct primitive Jurassic bird, formerly placed in the genus Archaeornis but now thought to be a species of archaeopteryx
- archdeacons — Plural form of archdeacon.
- archegonial — relating to an archegonium
- archegonium — a female sex organ, occurring in mosses, spore-bearing vascular plants, and gymnosperms, that produces a single egg cell in its swollen base
- archenteron — the cavity within an embryo at the gastrula stage of development that eventually becomes the digestive cavity
- arctic zone — the section of the earth's surface lying between the Arctic Circle and the North Pole.
- arduousness — requiring great exertion; laborious; difficult: an arduous undertaking.
- arenicolous — growing or living in sand or sandy places
- areocentric — relating to a reference system which has Mars as its centre
- armageddons — Plural form of armageddon.
- aroint thee — away! begone!
- arolla pine — a five-needled pine tree, Pinus cembra, found esp in mountain regions of Central Europe and yielding edible seeds
- aromatizing — Present participle of aromatize.
- aron kodesh — Holy Ark.
- arrestation — the slowing or stopping of the development or progress of something
- arrhenotoky — a form of parthenogenesis which produces only male offspring
- arse around — If you say that someone is arsing around or arsing about, you mean that they are behaving in a silly, irritating way instead of getting something done.
- arsonphobia — Pyrophobia.
- art nouveau — Art Nouveau is a style of decoration and architecture that was common in the 1890s. It is characterized by flowing lines and patterns of flowers and leaves.
- arthropodan — relating to arthropods
- arthur monk — (James) Arthur ("Art") born 1957, U.S. football player.
- artophorion — pyx (def 1a).
- arytenoidal — relating to the arytenoid cartilages in the larynx and also to other parts relating to them
- as concerns — in regard to; with reference to; about
- ascriptions — Plural form of ascription.
- asperations — Plural form of asperation.
- aspergation — the action of sprinkling, suffusing or irrigating with water
- aspirations — a strong desire, longing, or aim; ambition: intellectual aspirations.
- asportation — the removal or taking away of something
- assertation — An assertion, statement of opinion.
- assortments — Plural form of assortment.
- asteroidean — an echinoderm of the class Asteroidea, comprising the starfishes.
- astrobotany — the branch of botany that investigates the possibility that plants grow on other planets
- astrogation — (in science fiction) navigation in outer space.
- astrologian — (obsolete) An astrologer.
- astromancer — divination by means of the stars.
- astronautic — Of or pertaining to astronautics.
- astronomers — Plural form of astronomer.
- astronomize — to practise or study astronomy or engage in astronomical matters
- astrophyton — The giant basket star, an early Mesozoic invertebrate.
- asyncronous — (spelling) It's spelled "asynchronous".
- athermanous — capable of stopping radiant heat or infrared radiation
- atherogenic — causing atheroma
- atomtronics — (physics) The design, manufacture and study of analogs of electronics using atoms (especially Bose-Einstein condensates) at low temperature.