13-letter words containing o, b, t, a
- nonnegotiable — capable of being negotiated: a negotiable salary demand.
- nonobligatory — Not obligatory; not required; optional.
- nonprofitable — Not profitable; not making profit.
- nonreturnable — not returnable.
- north babylon — a city on S Long Island, in SE New York.
- north brabant — a province in S Netherlands. 1965 sq. mi. (5090 sq. km). Capital: 's Hertogenbosch.
- north by east — a point on the compass 11°15′ east of north. Abbreviation: NbE.
- notary public — a public officer or other person authorized to authenticate contracts, acknowledge deeds, take affidavits, protest bills of exchange, take depositions, etc.
- noticeability — The quality of being easy to see or notice.
- object clause — the clause that acts as the object of a verb
- object pascal — (language) An object-oriented Pascal developed jointly by Apple Computer and Niklaus Wirth.
- objectionable — causing or tending to cause an objection, disapproval, or protest.
- objectionably — causing or tending to cause an objection, disapproval, or protest.
- objurgatively — In an objurgative or reproving manner.
- oblique fault — a fault that runs obliquely to, rather than parallel to or perpendicular to, the strike of the affected rocks
- observability — capable of being or liable to be observed; noticeable; visible; discernible: an observable change in attitude.
- observational — of, relating to, or founded on observation, especially founded on observation rather than experiment.
- observatories — Plural form of observatory.
- observer team — a team deployed to an area of conflict to observe proceedings
- obstacle race — a foot race in which the contestants are prevented in a specific way from covering the full course at top speed, as by having hurdles to jump, sacks enclosing the legs, or potatoes to pick up.
- obstetrically — (medicine) In terms of obstetrics.
- obstetricians — Plural form of obstetrician.
- obstinateness — The characteristic of being obstinate.
- obtainability — to come into possession of; get, acquire, or procure, as through an effort or by a request: to obtain permission; to obtain a better income.
- octane number — (of gasoline) a designation of antiknock quality, numerically equal to the percentage of isooctane by volume in a mixture of isooctane and normal heptane that matches the given gasoline in antiknock characteristics.
- octosyllables — Plural form of octosyllable.
- odontoblastic — Relating to odontoblasts.
- open a bottle — If you open a bottle, you remove the cork or cap.
- opisthobranch — any gastropod mollusk of the order Opisthobranchia, as the sea slugs, sea butterflies, and sea hares, characterized by a vestigial or absent mantle and shell and two pairs of tentacles.
- optical bench — an apparatus, as a special table or rigid beam, for the precise positioning of light sources, screens, and optical instruments used for optical and photometric studies, having a ruled bar to which these devices can be attached and along which they can be readily adjusted.
- optical fiber — optical fibre
- optical fibre — (communications) (fibre optics, FO, US "fiber", light pipe) A plastic or glass (silicon dioxide) fibre no thicker than a human hair used to transmit information using infra-red or even visible light as the carrier (usually a laser). The light beam is an electromagnetic signal with a frequency in the range of 10^14 to 10^15 Hertz. Optical fibre is less susceptible to external noise than other transmission media, and is cheaper to make than copper wire, but it is much more difficult to connect. Optical fibres are difficult to tamper with (to monitor or inject data in the middle of a connection), making them appropriate for secure communications. The light beams do not escape from the medium because the material used provides total internal reflection. See also FDDI, Optical Carrier n, SONET.
- ora et labora — pray and work
- orbital index — the ratio of the maximum breadth to the maximum height of the orbital cavity multiplied by 100.
- orbitofrontal — Located in the frontal lobes above the orbits of the eyes.
- ornithophobia — Fear of birds.
- osteoblastoma — (oncology) an uncommon osteoid tissue-forming primary neoplasm of the bone.
- out and about — busy, active outside the home
- out of breath — the air inhaled and exhaled in respiration.
- out on a limb — a part or member of an animal body distinct from the head and trunk, as a leg, arm, or wing: the lower limbs; artificial limbs.
- outward bound — (in Britain) a scheme to provide adventure training for young people
- outward-bound — headed in an outward direction, as toward foreign ports: We passed an outward-bound ship as we came into the harbor.
- over-abstract — thought of apart from concrete realities, specific objects, or actual instances: an abstract idea.
- over-abundant — an excessive amount or abundance; surfeit: an overabundance of sugar in the diet.
- overambitious — having ambition; eagerly desirous of achieving or obtaining success, power, wealth, a specific goal, etc.: ambitious students.
- overbreathing — hyperventilation
- overelaborate — excessively or fussily elaborate, ornate, detailed, etc.
- overexcitable — Excessively excitable.
- overexuberant — effusively and almost uninhibitedly enthusiastic; lavishly abundant: an exuberant welcome for the hero.
- overnight bag — a travel bag large enough to hold personal articles and clothing for an overnight trip.