11-letter words containing a, t, r, o
- obsecration — to entreat solemnly; beseech; supplicate.
- observantly — quick to notice or perceive; alert.
- observation — an act or instance of noticing or perceiving.
- observative — Observant; watchful.
- observatory — a place or building equipped and used for making observations of astronomical, meteorological, or other natural phenomena, especially a place equipped with a powerful telescope for observing the planets and stars.
- obsignatory — (obsolete) Ratifying; confirming by sealing.
- obstetrical — of or relating to the care and treatment of women in childbirth and during the period before and after delivery.
- obtemperate — (obsolete) To obey.
- obumbration — the action of making dim, dark, obfuscated, or eclipsed
- oceanfronts — Plural form of oceanfront.
- ochlocratic — Pertaining to ochlocracy.
- octachordal — having or consisting of eight notes or eight strings
- octahedrite — anatase.
- octahedrons — Plural form of octahedron.
- octahydrate — (chemistry) A hydrate whose solid contains eight molecules of water of crystallization per molecule, or per unit cell.
- octal forty — (jargon) Jargon for "I'm drawing a blank.", I can't work it out.
- octandrious — having eight stamens.
- octonocular — eight-eyed
- odontograph — an instrument for laying out the forms of gear teeth or ratchets.
- off the air — a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere.
- old scratch — the devil; Satan.
- olfactories — of or relating to the sense of smell: olfactory organs.
- olfactorily — of or relating to the sense of smell: olfactory organs.
- ommatophore — a tentacle or movable stalk bearing an eye, as in certain snails.
- on a string — a slender cord or thick thread used for binding or tying; line.
- on retainer — hired, engaged, etc. by a retainer2 (sense 2)
- on the rack — If you say that someone is on the rack, you mean that they are suffering either physically or mentally.
- on the road — a novel (1957) by Jack Kerouac.
- one another — each other
- onslaughter — An onslaught.
- open market — an unrestricted competitive market in which any buyer and seller is free to participate.
- open-hearth — noting, pertaining to, or produced by the open-hearth process.
- openhearted — Frank and candid.
- operability — that can be treated by a surgical operation. Compare inoperable (def 2).
- operational — able to function or be used; functional: How soon will the new factory be operational?
- operatively — a person engaged, employed, or skilled in some branch of work, especially productive or industrial work; worker.
- operativity — a person engaged, employed, or skilled in some branch of work, especially productive or industrial work; worker.
- operatories — a room or other area with special equipment and facilities, as for dental surgery, scientific experiments, or the like.
- operculated — relating to the operculum
- opinionator — (obsolete) An opinionated person; one given to conjecture.
- oppignorate — to promise or give as security
- optical art — op art.
- or anything — You can add or anything to the end of a clause or sentence in order to refer vaguely to other things that are or may be similar to what has just been mentioned.
- or whatever — You say or whatever to refer generally to something else of the same kind as the thing or things that you have just mentioned.
- oracularity — Oracular speech or behaviour.
- oral cavity — inside of the mouth
- orange rust — a disease of blackberries and raspberries, characterized by an orange, powdery mass of spores on the undersides of the leaves and stunted, misshapen foliage, caused by a rust fungus, Gymnoconia interstitialis.
- orange-root — a plant, Hydrastis canadensis, of the buttercup family, having a thick yellow rootstock.
- orchardists — Plural form of orchardist.
- orchestrate — Arrange or score (music) for orchestral performance.