9-letter words containing s, t, o, r
- angostura — the bitter, aromatic bark of either of two South American citrus trees, Galipea officinalis or G. cusparia, used in medicine and in the preparation of liqueurs and bitters.
- angstroms — Plural form of angstrom.
- animators — Plural form of animator.
- anoestrus — a period of sexual inactivity between two periods of oestrus in many mammals
- answer to — a spoken or written reply or response to a question, request, letter, etc.: He sent an answer to my letter promptly.
- anterooms — Plural form of anteroom.
- antisolar — facing in the opposite direction to the sun
- antistory — a story which does not conform to the established conventions of storytelling
- apatosaur — a large, long-necked, herbivorous dinosaur
- apriorist — a person who believes in apriorism
- arborists — Plural form of arborist.
- archstone — a wedge-shaped stone forming the curved part of an arch
- areostyle — (of columned buildings) having a wide intercolumniation equal to four or more diameters of one of the columns
- argentous — of or containing silver in the monovalent state
- argonauts — Classical Mythology. a member of the band of men who sailed to Colchis with Jason in the ship Argo in search of the Golden Fleece.
- aristotle — a bottle
- armstrong — Edwin Howard. 1890–1954, US electrical engineer; invented the superheterodyne radio receiver and the FM radio
- 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)
- arrestors — Plural form of arrestor.
- arrogates — Third-person singular simple present indicative form of arrogate.
- 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
- ascorbate — a salt of ascorbic acid
- ashburton — 1st Baron, Baring, Alexander.
- ashtoreth — an ancient Semitic fertility goddess, identified with Astarte and Ishtar
- 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
- 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.