9-letter words containing a, e, r, o
- one-track — having only one track.
- opacifier — an agent added to render something opaque
- opera hat — a man's tall, collapsible top hat, held open or in shape by springs and usually covered with a black, silky fabric. Also called gibus. Compare beaver1 (def 4), silk hat, top hat.
- operagoer — a person who attends opera performances.
- operantly — In an operant manner.
- operatics — Exaggerated or overly emotional behaviour; histrionics.
- operating — used or engaged in performing operations: an operating surgeon.
- operation — an act or instance, process, or manner of functioning or operating.
- operative — a person engaged, employed, or skilled in some branch of work, especially productive or industrial work; worker.
- operatize — to turn (a play, novel, etc) into an opera
- operators — Plural form of operator.
- operatory — a room or other area with special equipment and facilities, as for dental surgery, scientific experiments, or the like.
- opercular — Botany, Zoology. a part or organ serving as a lid or cover, as a covering flap on a seed vessel.
- operettas — Plural form of operetta.
- orangeade — a beverage consisting of orange juice, sweetener, and water, sometimes carbonated.
- orangeism — the principles and practices of the Orangemen.
- orangeman — a member of a secret society formed in the north of Ireland in 1795, having as its object the maintenance and political ascendancy of Protestantism.
- orangemen — a member of a secret society formed in the north of Ireland in 1795, having as its object the maintenance and political ascendancy of Protestantism.
- oratories — Plural form of oratory.
- orcharder — One who owns or operates an orchard.
- orchestra — a group of performers on various musical instruments, including especially stringed instruments of the viol class, clarinets and flutes, cornets and trombones, drums, and cymbals, for playing music, as symphonies, operas, popular music, or other compositions.
- orderable — an authoritative direction or instruction; command; mandate.
- ordinaire — an ordinary table wine
- ordinance — an authoritative rule or law; a decree or command.
- ordinated — Simple past tense and past participle of ordinate.
- ordinates — Plural form of ordinate.
- oregonian — of Oregon
- organelle — Cell Biology. a specialized part of a cell having some specific function; a cell organ.
- organised — to form as or into a whole consisting of interdependent or coordinated parts, especially for united action: to organize a committee.
- organiser — Standard spelling of organizer.
- organises — Third-person singular simple present indicative form of organise.
- organized — affiliated in an organization, especially a union: organized dockworkers.
- organizer — a person who organizes, especially one who forms and organizes a group.
- organizes — Third-person singular simple present indicative form of organize.
- organzine — silk that has been additionally twisted in opposite directions, used warpwise in weaving silk fabrics.
- orientals — Plural form of oriental.
- orientate — (UK, intransitive) To face (a given direction).
- oriflamme — the red banner of St. Denis, near Paris, carried before the early kings of France as a military ensign.
- originate — to take its origin or rise; begin; start; arise: The practice originated during the Middle Ages.
- orkneyman — a native or inhabitant of Orkney
- orleanais — a former province in N France. Capital: Orléans.
- orleanist — a supporter of the Orléans branch of the former French royal family and of its claim to the throne of France through descent from the younger brother of Louis XIV.
- ornaments — Plural form of ornament.
- orphanage — an institution for the housing and care of orphans.
- ortanique — A citrus fruit that is a cross between an orange and a tangerine, developed in Jamaica in the 1920s.
- orthopnea — difficult or painful breathing except in an erect sitting or standing position.
- orwellian — of, pertaining to, characteristic of, or resembling the literary work of George Orwell or the totalitarian future described in his antiutopian novel 1984 (1949).
- osmeteria — glands in some caterpillars that secrete foul-smelling substances to deter predators
- ossifrage — the lammergeier.
- ossuaries — Plural form of ossuary.