9-letter words containing a, r, o, s
- arnoldson — Klas Pontus [klahs pawn-tuh s] /klɑs ˈpɔn təs/ (Show IPA), 1844–1916, Swedish author and politician: Nobel Peace Prize 1908.
- aromatase — an enzyme that converts testosterone into an oestrogen
- aromatics — Plural form of aromatic.
- aromatise — Alternative spelling of aromatize.
- aroostook — river in N Me., flowing into the St. John River in New Brunswick, Canada: c. 140 mi (225 km)
- arousable — able to be aroused
- arpeggios — Plural form of arpeggio.
- arrestors — Plural form of arrestor.
- arrogates — Third-person singular simple present indicative form of arrogate.
- arrowless — having no arrows
- arseholed — very drunk
- arsenious — of or containing arsenic in the trivalent state
- arsonists — Plural form of arsonist.
- art house — a motion-picture theater specializing in the exhibition of art films.
- art-house — An art-house film is a film that is intended to be a serious artistic work rather than a piece of popular entertainment.
- artemovsk — a city in E Ukraine.
- arthroses — Plural form of arthrosis.
- arthrosis — a bone joint which enables movement
- aryballos — a small narrow-necked vessel or bottle shaped like a sphere, used in ancient Greece to store oil or perfume
- ascocarps — Plural form of ascocarp.
- ascorbate — a salt of ascorbic acid
- ascospore — one of the spores (usually eight in number) that are produced in an ascus
- ash color — ash gray.
- ashburton — 1st Baron, Baring, Alexander.
- ashtoreth — an ancient Semitic fertility goddess, identified with Astarte and Ishtar
- asmoulder — in a smouldering or slowly burning manner
- aspersion — a disparaging or malicious remark; slanderous accusation (esp in the phrase cast aspersions (on))
- aspirator — a device employing suction, such as a jet pump or one for removing fluids from a body cavity
- assertion — a positive statement, usually made without an attempt at furnishing evidence
- assertory — characterized by or relating to declaration or affirmation
- assessors — Plural form of assessor.
- assorting — Present participle of assort.
- assortive — to distribute, place, or arrange according to kind or class; classify; sort.
- asteroids — Plural form of asteroid.
- astrocyte — any of the star-shaped cells in the tissue supporting the brain and spinal cord (neuroglia)
- astrodome — a transparent dome on the top of an aircraft, through which observations can be made, esp of the stars
- astrofell — (in the works of Spenser) an unidentified plant, commonly believed to be akin to an aster
- astrogate — (science fiction, intransitive) To astronavigate; to control and guide a spacecraft.
- astroglia — The group of star-shaped glial cells in the brain and spinal cord.
- astrolabe — an instrument used by early astronomers to measure the altitude of stars and planets and also as a navigational aid. It consists of a graduated circular disc with a movable sighting device
- astrology — Astrology is the study of the movements of the planets, sun, moon, and stars in the belief that these movements can have an influence on people's lives.
- astronaut — An astronaut is a person who is trained for travelling in a spacecraft.
- astronomy — Astronomy is the scientific study of the stars, planets, and other natural objects in space.
- astroturf — Astroturf is a type of artificial fiber that is used instead of grass on some sports fields.
- at source — at the point of origin
- atheromas — Plural form of atheroma.
- atherosis — (pathology) atheroma.
- atomizers — Plural form of atomizer.
- atrocious — If you describe something as atrocious, you are emphasizing that its quality is very bad.
- atrophies — Also, atrophia [uh-troh-fee-uh] /əˈtroʊ fi ə/ (Show IPA). Pathology. a wasting away of the body or of an organ or part, as from defective nutrition or nerve damage.