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15-letter words containing a, p, r

  • back plastering — the introduction of partitions of lath and plaster between the inner and outer surfaces of a stud wall in order to improve the insulating properties of the wall.
  • back projection — a method of projecting pictures onto a translucent screen so that they are viewed from the opposite side, used esp in films to create the illusion that the actors in the foreground are moving
  • backup rotation — (operating system)   Any system for re-using backup media, e.g. magnetic tape. One extreme would be to use the same media for every backup (e.g. copy disk A to disk B), the other extreme would be to use new media every time. The trade-off is between the cost of buying and storing media and the ability to restore any version of any file. One example is the Grandfather, Father, Son (GFS) scheme.
  • backup software — (tool, software)   Software for doing a backup, often included as part of the operating system. Backup software should provide ways to specify what files get backed up and to where. It may include its own scheduling function to automate the procedure or, preferably, work with generic scheduling facilities. It may include facilities for managing the backup media (e.g. maintaining an index of tapes) and for restoring files from backups. Examples are Unix's dump command and Windows's ntbackup.
  • bacteriophagous — Pertaining to the predation and consumption of bacterium.
  • bad housekeeper — a person who is not an efficient and thrifty domestic manager
  • ballpark figure — approximate number
  • ballpeen hammer — a hammer that has one end of its head shaped in a hemisphere for beating metal, etc
  • banana republic — Small, poor countries that are politically unstable are sometimes referred to as banana republics.
  • bandpass filter — A bandpass filter is a filter designed to pass all frequencies within a band of frequencies.
  • bandstop filter — A bandstop filter is a filter designed to eliminate all frequencies within a band of frequencies.
  • banking product — one of the various services offered by a bank to its customers: mortgages, loans, insurance etc
  • baptism of fire — If someone who has just begun a new job has a baptism of fire, they immediately have to cope with very many severe difficulties and obstacles.
  • bargaining chip — In negotiations with other people, a bargaining chip is something that you are prepared to give up in order to obtain what you want.
  • barium peroxide — a gray-white powder, BaO2, used as a bleach and in making hydrogen peroxide
  • barium sulphate — a white insoluble fine dense powder, used as a pigment, as a filler for paper, rubber, etc, and in barium meals. Formula: BaSO4
  • barothermograph — an automatic instrument for recording pressure and temperature.
  • basses-pyrenees — former name of Pyrénées-Atlantiques.
  • battleship gray — a subdued bluish gray.
  • bayeux tapestry — an 11th- or 12th-century embroidery in Bayeux, nearly 70.5 m (231 ft) long by 50 cm (20 inches) high, depicting the Norman conquest of England
  • beam-power tube — a vacuum tube in which the stream of electrons flowing to the plate is focused by the action of a set of auxiliary, charged elements, giving an increase in output power.
  • bear comparison — to be sufficiently similar in class or range to be compared with (something else), esp favourably
  • beet leafhopper — a small leafhopper (Circulifer tenellus) that transmits a very destructive virus to sugar beets
  • ben day process — a method of adding texture, shading, or detail to line drawings by overlaying a transparent sheet of dots or any other pattern during platemaking
  • bias (ply) tire — a motor vehicle tire having a foundation of plies of rubberized cords in a crisscross pattern of lines diagonal to the center line of the tread
  • biblia pauperum — any of the picture books illustrating Biblical events and usually containing a short text, used chiefly in the Middle Ages for purposes of religious instruction.
  • bibliographical — a complete or selective list of works compiled upon some common principle, as authorship, subject, place of publication, or printer.
  • billiard parlor — poolroom (def 1).
  • biobibliography — a bibliography containing biographical sketches of the authors listed.
  • biostratigraphy — the examination of the ages of rock strata by using fossils
  • bipartite graph — complete graph
  • birch partridge — ruffed grouse
  • bird of passage — If you refer to someone as a bird of passage, you mean that they are staying in a place for a short time before going to another place.
  • black operation — a covert and undocumented military operation
  • black raspberry — a plant, Rubus occidentalis, of E North America, that has black berry-like fruits
  • black september — a Palestinian Terrorist group, responsible for the assassinations of Israeli athletes at the Olympic Games at Munich in 1972
  • bladder campion — a European caryophyllaceous plant, Silene vulgaris, having white flowers with an inflated calyx
  • blasting powder — a form of gunpowder made with sodium nitrate instead of saltpeter, used chiefly for blasting rock, ore, etc.
  • board of parole — an agency that determines which prisoners are to be released on parole
  • brachial plexus — a network of nerves in the armpits and neck, innervating the shoulders, arms, and hands.
  • brachiocephalic — of, relating to, or supplying the arm and head
  • braille display — (hardware)   (Or "refreshable braille display", "refreshable display") An electromechanical device that renders braille with tiny, independently controlled pins used to represent the state of dots in braille cells. Each pin, in its "on" state, raises above the top of its hole in the screen; in its "off" state, it drops below the top of its hole. Older systems used tiny solenoids to control the state of the pins; modern systems are piezoelectric. Typical dimensions of a braille display are 1 line of 40 cells, each cell of two-by-eight dots.
  • braille printer — (printer)   (Or "(Braille) embosser") A printer, necessarily an impact printer, that renders text as Braille. Blind users call other printers ink printers.
  • brake parachute — a parachute attached to the rear of a vehicle and opened to assist braking
  • branchial pouch — one of a series of rudimentary outcroppings of the inner pharyngeal wall, corresponding to the branchial grooves on the surface.
  • brazilian plume — a tropical American plant, Justicia carnea, of the acanthus family, having hairy, prominently veined leaves and a short, dense cluster of purple or pink flowers, grown in greenhouses or outdoors in warm regions.
  • break-in period — a period during which certain restrictions or moderation in operating should be followed, as the avoidance of high speed, rapid acceleration, or severe braking for a new automobile.
  • break-out group — a group of people who detach themselves from a larger group or meeting in order to hold separate discussions
  • breakeven point — a point at which the total revenue and total cost are equal
  • breaking plough — a plough with a long shallow mouldboard for turning virgin land or sod land
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