13-letter words containing t, b, o
- 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
- obsolescently — In an obsolescent manner.
- 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.
- obstructively — In an obstructive manner.
- 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.
- obtrusiveness — having or showing a disposition to obtrude, as by imposing oneself or one's opinions on others.
- 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.
- off the books — of or relating to a book or books: the book department; a book salesman.
- off-the-books — not recorded in account books or not reported as taxable income.
- offertory box — the box or container where worshippers' put their offerings (usually money)
- on the bounce — in succession; one after the other
- on the bubble — in a situation in which the outcome is uncertain but already in the process of being determined or decided
- on the button — a small disk, knob, or the like for sewing or otherwise attaching to an article, as of clothing, serving as a fastening when passed through a buttonhole or loop.
- on the double — twice as large, heavy, strong, etc.; twofold in size, amount, number, extent, etc.: a double portion; a new house double the size of the old one.
- only-begotten — (of a child) being the only offspring of its father
- open a bottle — If you open a bottle, you remove the cork or cap.
- open brethren — one of the two main divisions of the Plymouth Brethren that, in contrast to the Exclusive Brethren, permits contacts with members outside the sect
- open-timbered — constructed so that the timbers are exposed.
- 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.
- ostensibility — The quality of being ostensible.
- osteoblastoma — (oncology) an uncommon osteoid tissue-forming primary neoplasm of the bone.
- osteofibrosis — loss of calcium from the bones, causing them to become fragile
- ostrobogulous — (humorous) Slightly risqu\u00e9 or indecent; bizarre, interesting, or unusual.
- out and about — busy, active outside the home
- out of bounds — Sports. being beyond or passing the limits or boundaries of a field, course, etc., marking the area within which the ball, puck, or the like is legally in play.
- 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.
- out-of-bounds — Sports. being beyond or passing the limits or boundaries of a field, course, etc., marking the area within which the ball, puck, or the like is legally in play.
- 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.