Part 206

4. A cycle having five crank shafts and adapted for five riders, all of whom can assist in the propulsion.

Quir"i*nal (?), a. [L. Quirinals, fr. Quirinus, a name of Romulus.] Of, pertaining to, or designating, the hill Collis Quirinalis, now Monte Quirinale (one of the seven hills of Rome), or a modern royal place situated upon it. Also used substantively.

Quod (?), v. t. To put in quod, or prison; to lock up; to jug. [Slang] Kipling.

||Ra`bat" (?), n. [F. Cf. Rabato.] (Eccl.) (a) A clerical linen collar. (b) A kind of clerical scarf fitted to a collar; as, a black silk rabat.

Race"a*bout` (?), n. (Naut.) A small sloop-rigged racing yacht carrying about six hundred square feet of sail, distinguished from a knockabout by having a short bowsprit.

Race suicide. The voluntary failure of the members of a race or people to have a number of children sufficient to keep the birth rate equal to the death rate.

Rack"a*rock` (?), n. [Rack to stretch, strain + a + rock.] A Sprengel explosive consisting of potassium chlorate and mono-nitrobenzene.

Rack"et, n. A scheme, dodge, trick, or the like; something taking place considered as exciting, trying, unusual, or the like; also, such occurrence considered as an ordeal; as, to work a racket; to stand upon the racket. [Slang]

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Radial engine. (Mach.) An engine, usually an internal-combustion engine of a certain type (the radial type) having several cylinders arranged radially like the spokes of a complete wheel. The semiradial engine has radiating cylinders on only one side of the crank shaft.

Ra"di*ant (?), a. (Physics) Emitted or transmitted by radiation; as, a radiant energy; radiant heat.

Radiant engine. (Mach.) A semiradial engine. See Radial engine, above.

Ra"di*a`tor (?), n. 1. Any of various devices for cooling an internal substance by radiation, as a system og rings on a gun barrel for cooling it, or a nest of tubes with large radiating surface for cooling circulating water, as in an automobile.

2. (Wireless Teleg.) An oscillator.

Ra"di*o (?), a. Of or pertaining to, or employing, or operated by, radiant energy, specifically that of electric waves; hence, pertaining to, or employed in, radiotelegraphy.

Ra`di*o-ac"tive (?), a. [Radio- + active.] (Physics) Capable of luminescence under the action of cathode rays, X rays, or any of the allied forms of radiation. -- Ra`di*o-ac*tiv"i*ty, n.

Ra`di*o*con*duc"tor (?), n. (Elec.) A substance or device that has its conductivity altered in some way by electric waves, as a coherer.

Ra"di*o*graph (?), n. [Radio- + -graph.] 1. An instrument for measuring and recording solar radiation.

2. An image or picture produced upon a sensitive surface, as of a photographic plate, by some form of radiation other than light, as the Röntgen rays, radium rays, etc.; esp., a picture of opaque objects traversed by the rays; a skiagraph.

Ra"di*o*graph, v. t. To make a radiograph of. -- Ra`di*og"ra*pher (#), n.

Ra`di*og"ra*phy (?), n. Art or process of making radiographs. -- Ra`di*o*graph"ic (#), *graph"ic*al (#), a. -- Ra`di*o*graph"ic*al*ly, adv.

Ra`di*om"e*try (?), n. (Physics) The use of the radiometer, or the measurement of radiation. -- Ra`di*o*met"ric (#), a.

Ra"di*o*phare (?), n. [Radio- + phare.] A radiotelegraphic station serving solely for determining the position of ships. The radius of operation of such stations was restricted by the International Radiotelegraphic Convention (1912) to 30 nautical miles.

Ra`di*op"ti*con (?), n. [Radio- + stereopticon.] See Projector, above.

Ra`di*os"co*py (?), n. [Radio- + -scopy.] Direct observation of objects opaque to light by means of some other form of radiant energy, as the Röntgen rays. -- Ra`di*o*scop"ic (#), *scop"ic*al (#), a.

Ra`di*o*tel"e*gram (?), n. A message transmitted by radiotelegraph.

Ra`di*o*tel"e*graph (?), n. [Radio- + telegraph.] A wireless telegraph.

Ra`di*o*tel`e*graph"ic (?), a. Of or pertaining to radiotelegraphy; employing, or used or employed in, radiotelegraphy.