13-letter words containing b, o, u, r
- double-ripper — bobsled (def 2).
- doublespeaker — a person who uses doublespeak
- draughtboards — Plural form of draughtboard.
- draughtsboard — The board on which draughts is played, resembling a chessboard but (depending on the game variation) often having a side length of ten squares rather than eight.
- durable goods — Durable goods or durables are goods such as televisions or cars which are expected to last a long time, and are bought infrequently.
- durban poison — a particularly potent variety of cannabis grown in Natal
- ebola (virus) — an RNA virus (family Filoviridae) that causes fever, internal bleeding, and, often, death
- electron tube — (electronics) (Or tube, vacuum tube, UK: valve, electron valve, thermionic valve, firebottle, glassfet) An electronic component consisting of a space exhausted of gas to such an extent that electrons may move about freely, and two or more electrodes with external connections. Nearly all tubes are of the thermionic type where one electrode, called the cathode, is heated, and electrons are emitted from its surface with a small energy (typically a Volt or less). A second electrode, called the anode (plate) will attract the electrons when it is positive with respect to the cathode, allowing current in one direction but not the other. In types which are used for amplification of signals, additional electrodes, called grids, beam-forming electrodes, focussing electrodes and so on according to their purpose, are introduced between cathode and plate and modify the flow of electrons by electrostatic attraction or (usually) repulsion. A voltage change on a grid can control a substantially greater change in that between cathode and anode. Unlike semiconductors, except perhaps for FETs, the movement of electrons is simply a function of electrostatic field within the active region of the tube, and as a consequence of the very low mass of the electron, the currents can be changed quickly. Moreover, there is no limit to the current density in the space, and the electrodes which do dissapate power are usually metal and can be cooled with forced air, water, or other refrigerants. Today these features cause tubes to be the active device of choice when the signals to be amplified are a power levels of more than about 500 watts. The first electronic digital computers used hundreds of vacuum tubes as their active components which, given the reliability of these devices, meant the computers needed frequent repairs to keep them operating. The chief causes of unreliability are the heater used to heat the cathode and the connector into which the tube was plugged. Vacuum tube manufacturers in the US are nearly a thing of the past, with the exception of the special purpose types used in broadcast and image sensing and displays. Eimac, GE, RCA, and the like would probably refer to specific types such as "Beam Power Tetrode" and the like, and rarely use the generic terms. The cathode ray tube is a special purpose type based on these principles which is used for the visual display in television and computers. X-ray tubes are diodes (two element tubes) used at high voltage; a tungsten anode emits the energetic photons when the energetic electrons hit it. Magnetrons use magnetic fields to constrain the electrons; they provide very simple, high power, ultra-high frequency signals for radar, microwave ovens, and the like. Klystrons amplify signals at high power and microwave frequencies.
- encourageable — Able to be encouraged; suggestible.
- equilibration — The formation, or maintenance, of an equilibrium.
- equilibratory — Relating to the physical sense of balance, or equilibrium.
- faculty board — the governing body of a faculty
- farm labourer — a person engaged in physical work on a farm
- fibromuscular — (anatomy) Of or pertaining to both fibrous and muscular tissue.
- fibrovascular — composed of fibrous and conductive tissue, as in the vascular systems of higher plants: a fibrovascular bundle.
- filibusterous — resembling a filibuster or the actions of a filibuster
- fluorocarbons — Plural form of fluorocarbon.
- flutterboards — Plural form of flutterboard.
- forced labour — labour done because of force; compulsory labour
- froude number — a dimensionless number used in hydrodynamics for model simulation of actual conditions
- fruiting body — an organ that produces spores; fructification.
- fuel air bomb — a type of bomb that spreads a cloud of gas, which is then detonated, over the target area, causing extensive destruction
- fume cupboard — vent used in a laboratory
- funambulatory — relating to tightrope-walking
- george w bush — Barbara (Barbara Pierce) born 1925, U.S. First Lady 1989–93 (wife of George H. W. Bush).
- girl's blouse — used to refer to a man who is not behaving in a very strong or masculine way
- globuliferous — containing or producing globules.
- gobar numeral — any of a set of ancient numerals derived from Hindu numerals
- golden number — a number between 1 and 19, used to indicate the position of any year in the Metonic cycle, calculated as the remainder when 1 is added to the given year and the sum is divided by 19. If the remainder is zero the number is 19
- ground beetle — any of numerous nocturnal, terrestrial beetles of the family Carabidae that feed chiefly on other insects.
- groundbreaker — a person who is an originator, innovator, or pioneer in a particular activity.
- gubernatorial — of or relating to a state governor or the office of state governor.
- habeas corpus — a writ requiring a person to be brought before a judge or court, especially for investigation of a restraint of the person's liberty, used as a protection against illegal imprisonment.
- halobacterium — Any of various extremophiles, of genus Halobacterium, found in water saturated or nearly saturated with salt.
- harbourmaster — (British, Canada, nautical) An official responsible for the enforcement of regulations in a port.
- harold burton — Harold Hitz [hits] /hɪts/ (Show IPA), 1888–1964, associate justice of the U.S. Supreme Court 1945–58.
- heart trouble — cardiac condition
- homework club — an after-school club where students can stay to do their homework
- honey buzzard — a long-tailed Old World hawk, Pernis apivorus, that feeds on the larvae of bees as well as on small rodents, reptiles, and insects.
- honour bright — an exclamation pledging honour
- honourability — A state or condition or being honourable.
- hot cross bun — a bun with a cross of frosting on it, eaten chiefly during Lent.
- housebreakers — Plural form of housebreaker.
- housebreaking — to train (a pet) to excrete outdoors or in a specific place.
- hunt saboteur — A hunt saboteur is someone who tries to stop a hunt from taking place or being successful because they believe it is cruel to the animal being hunted.
- hunter's robe — pothos.
- hybrid vigour — the increased size, strength, etc, of a hybrid as compared to either of its parents
- immunosorbent — an insoluble surface to which a specific antibody is attached for the purpose of removing the corresponding antigen from a solution or suspension.
- inconquerable — That cannot be conquered; unconquerable.
- inconstruable — unable to be construed