9-letter words containing o, s, a, r
- androcles — (in Roman legend) a slave whose life was spared in the arena by a lion from whose paw he had once extracted a thorn
- androgens — Plural form of androgen.
- androgeus — a son of Minos and Pasiphaë who fell victim to Athenian King Aegeus: in revenge, Minos waged war on the Athenians and forced them to send a tribute of seven maidens and seven youths to the Minotaur every nine years.
- androides — Dated form of android.
- androsace — any plant of the genus Androsace, of the primrose family, having basal leaves and white or reddish flowers.
- anestrous — not showing estrus.
- angashore — a miserable person given to complaining
- 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.
- anhydrous — containing no water, esp no water of crystallization
- animators — Plural form of animator.
- anoestrus — a period of sexual inactivity between two periods of oestrus in many mammals
- anorakish — (British, informal) Obsessively absorbed in a subject, especially an unusual or obscure subject.
- anorchism — Anorchia.
- anorexics — Plural form of anorexic.
- anorgasmy — inability to experience sexual orgasm.
- 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
- aphorisms — Plural form of aphorism.
- aphorizes — Third-person singular simple present indicative form of aphorize.
- apivorous — eating bees
- approvals — Plural form of approval.
- approvers — a person who approves.
- apriorism — the philosophical doctrine that there may be genuine knowledge independent of experience
- apriorist — a person who believes in apriorism
- apronfuls — Plural form of apronful.
- aprosexia — Inability to concentrate.
- arabinose — a pentose sugar in plant gums, esp of cedars and pines. It is used as a culture medium in bacteriology. Formula: C5H10O5
- aragonese — a native or inhabitant of Aragon
- arboreous — thickly wooded; having many trees
- arborists — Plural form of arborist.
- arbovirus — any one of a group of viruses that cause such diseases as encephalitis and dengue and are transmitted to humans by arthropods, esp insects and ticks
- arccosine — the function the value of which for a given argument between –1 and 1 is the angle in radians (between 0 and π), the cosine of which is that argument: the inverse of the cosine function
- archosaur — any of a group of reptiles consisting of dinosaurs, pterosaurs, modern birds, modern crocodiles and extinct relatives of crocodiles, all having a diapsid skull
- archstone — a wedge-shaped stone forming the curved part of an arch
- arcsecond — unit used in astronomy
- arduously — requiring great exertion; laborious; difficult: an arduous undertaking.
- areopagus — the hill to the northwest of the Acropolis in Athens
- 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
- armorless — any covering worn as a defense against weapons.
- armourers — Plural form of armourer.
- armouries — a drill hall used for training and as headquarters by a reserve unit of the armed forces
- armstrong — Edwin Howard. 1890–1954, US electrical engineer; invented the superheterodyne radio receiver and the FM radio
- armyworms — Plural form of armyworm.