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13-letter words starting with r

  • rocket engine — a reaction engine that produces a thrust due to an exhaust consisting entirely of material, as oxidizer, fuel, and inert matter, that has been carried with the engine in the vehicle it propels, none of the propellant being derived from the medium through which the vehicle moves.
  • rocking chair — a chair mounted on rockers or springs so as to permit a person to rock back and forth while sitting.
  • rocking horse — a toy horse, as of wood, mounted on rockers or springs, on which children may ride; hobbyhorse.
  • rocking shear — a shear having a curved blade that cuts with a rocking motion.
  • rocking stone — any fairly large rock so situated on its base that slight forces can cause it to move or sway.
  • rocking valve — (on a steam engine) a valve mechanism oscillating through an arc to open and close.
  • roentgenogram — a photograph made with x-rays.
  • roentgenology — the branch of medicine dealing with diagnosis and therapy through x-rays.
  • rogation days — Usually, rogations. Ecclesiastical. solemn supplication, especially as chanted during procession on the three days (Rogation Days) before Ascension Day.
  • roger-ducasse — Jean Jules Amable [zhahn zhyl a-ma-bluh] /ʒɑ̃ ʒül aˈma blə/ (Show IPA), 1873–1954, French composer.
  • rogue dialler — a dial-up connection placed on a computer without the user's knowledge which, when the user tries to connect to the internet, automatically connects to a premium-rate phone number
  • rogue program — a computer virus
  • rogue's march — a derisive tune played to accompany a person's expulsion from a regiment, community, etc.
  • role conflict — emotional conflict arising when competing demands are made on an individual in the fulfillment of his or her multiple social roles.
  • role reversal — Role reversal is a situation in which two people have chosen or been forced to exchange their duties and responsibilities, so that each is now doing what the other used to do.
  • roll-over arm — an upholstered chair or sofa arm that curves outward and downward.
  • roll-top desk — a flexible, sliding cover for the working area of a desk, opening by rising upward and back in quadrantal grooves and rolling up beneath the top.
  • roll-your-own — a cigarette that one has rolled oneself.
  • rolled collar — a collar that stands up slightly from the point of attachment to the neckline of a garment before folding over to lie flat.
  • roller hockey — a game similar to ice hockey played on roller skates.
  • rollerblading — skating on rollerblades
  • rollercoaster — a small gravity railroad, especially in an amusement park, having a train with open cars that moves along a high, sharply winding trestle built with steep inclines that produce sudden, speedy plunges for thrill-seeking passengers.
  • rolling hitch — a hitch on a spar or the like, composed of two round turns and a half hitch so disposed as to jam when a stress is applied parallel to the object on which the hitch is made.
  • rolling paper — cigarette paper available in small packages to smokers for rolling their own cigarettes.
  • rolling stock — the wheeled vehicles of a railroad, including locomotives, freight cars, and passenger cars.
  • rolling stone — person: nomadic
  • roman holiday — a public spectacle or controversy marked by barbarism, vindictiveness, or scandal.
  • roman letters — a typeface used in ancient Roman inscriptions
  • roman numeral — one of the numerals in the ancient Roman system of notation, still used for certain limited purposes, as in some pagination, dates on buildings, etc. The common basic symbols are I, (=1), V, (=5), X, (=10), L, (=50), C, (=100), D, (=500), and M, (=1000). The Roman numerals for one to nine are: I, II, III, IV, V, VI, VII, VIII, IX. A bar over a letter multiplies it by 1000; thus, X̅ equals 10,000. Integers are written according to these two rules: If a letter is immediately followed by one of equal or lesser value, the two values are added; thus, XX equals 20, XV equals 15, VI equals 6. If a letter is immediately followed by one of greater value, the first is subtracted from the second; thus, IV equals 4, XL equals 40, CM equals 900. Examples: XLVII(=47), CXVI(=116), MCXX(=1120), MCMXIV(=1914). Roman numerals may be written in lowercase letters, though they appear more commonly in capitals.
  • romantic lead — a person who plays the main character in a romantic film or play
  • romantic love — love characterized by romance and involving sexual attraction
  • romanticality — the state or quality of being romantic
  • romanticising — to make romantic; invest with a romantic character: Many people romanticize the role of an editor.
  • rond de jambe — a circular movement of the leg.
  • rooming house — a house with furnished rooms to rent; lodging house.
  • roosevelt dam — a dam on the Salt River, in central Arizona. 284 feet (87 meters) high; 1080 feet (329 meters) long.
  • root division — the act or process of reproducing plants by a division of roots or crowns.
  • root of unity — a complex number that when raised to some positive integral power results in 1.
  • root position — the position of a triad in which the root is in the bass.
  • root pressure — osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves.
  • rory o'connor — Also called Roderic. ?1116–98, king of Connaught and last High King of Ireland
  • rose d'anvers — a gem having a rose cut of 12 or fewer facets.
  • rose geranium — a geranium, Pelargonium graveolens, cultivated for its fragrant, lobed or narrowly divided leaves.
  • rose mandarin — (in the Chinese Empire) a member of any of the nine ranks of public officials, each distinguished by a particular kind of button worn on the cap.
  • rose of china — China rose (def 2).
  • rose-coloured — of the colour rose; rosy
  • rosebud mouth — a mouth that resembles the unopened flower of a rose in shape
  • rosehip syrup — a syrup made from rosehips, used as a cough remedy
  • rosenkavalier — an opera (1911) by Richard Strauss.
  • rosetta stone — a stone slab, found in 1799 near Rosetta, bearing parallel inscriptions in Greek, Egyptian hieroglyphic, and demotic characters, making possible the decipherment of ancient Egyptian hieroglyphics.
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