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13-letter words containing u, n, b, r, o

  • durban poison — a particularly potent variety of cannabis grown in Natal
  • 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.
  • fluorocarbons — Plural form of fluorocarbon.
  • froude number — a dimensionless number used in hydrodynamics for model simulation of actual conditions
  • fruiting body — an organ that produces spores; fructification.
  • funambulatory — relating to tightrope-walking
  • 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.
  • harold burton — Harold Hitz [hits] /hɪts/ (Show IPA), 1888–1964, associate justice of the U.S. Supreme Court 1945–58.
  • 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.
  • 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.
  • 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
  • incorruptable — Misspelling of incorruptible.
  • incorruptible — not corruptible: incorruptible integrity.
  • incorruptibly — In an incorruptible manner.
  • indolebutyric — as in indolebutyric acid, a synthetic plant growth regulator
  • inner harbour — a part of a harbour which is further inland
  • inobtrusively — in an unobtrusive manner
  • insubordinate — not submitting to authority; disobedient: an insubordinate soldier.
  • insupportable — not endurable; unbearable; insufferable: insupportable pain.
  • insupportably — In an insupportable manner.
  • kennebunkport — a town in SW Maine: summer resort.
  • laboriousness — requiring much work, exertion, or perseverance: a laborious undertaking.
  • labour unrest — unrest or dissatisfaction displayed by workers, often in the form of strikes, and sometimes violent disputes, etc, which disrupts normal business
  • labour-saving — A labour-saving device or idea makes it possible for you to do something with less effort than usual.
  • lambeosaurine — Any crested hadrosaurid dinosaur of the subfamily Lambeosaurinae.
  • lepton number — in a process involving elementary particles, the total number of leptons minus the total number of antileptons.
  • lubber's knot — an improperly made reef or square knot, likely to slip loose.
  • lunar orbiter — one of a series of space probes that orbited and photographed the moon in 1966 and 1967.
  • lunar rainbow — moonbow.
  • luxembourgian — of or relating to Luxembourg, its people, or their language.
  • macroglobulin — A plasma globulin of high molecular weight.
  • mandibuliform — Having the form of a mandible; - said especially of the maxill\u00e6 of an insect when hard and adapted for biting.
  • melbourne cup — an annual horse race run in Melbourne, since 1861
  • membranaceous — Resembling or having properties of a membrane.
  • microbusiness — A business that operates on a very small scale.
  • mobile number — a set of figures identifying the mobile telephone of a particular subscriber, and used in making connections to that telephone
  • money grubber — a person who is aggressively engaged in or preoccupied with making or saving money.
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