| Rockwell hardness n. |
a number indicative of the degree of relative hardness of materials, determined by measuring the depth of the impression made by a steel or diamond penetrator pressed into the surface of the material being tested. There are a number of Rockwell hardness tests and scales, using various combinations of loads and penetrators; the load and penetrator combination must always be specified when stating a Rockwell hardness number.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| Rocky Mountain spotted f. |
an acute, infectious, sometimes fatal disease caused by Rickettsia rickettsii, usually transmitted by the bite of an infected ixodid tick, usually Dermacentor andersoni (wood tick) or D. variabilis (dog tick); it occurs only in North and South America. It is characterized by sudden onset; chills; fever lasting 2 to 3 weeks; a cutaneous rash that generally appears between the second and sixth days and spreads from the distal extremities to the proximal extremities, trunk, and face; myalgias; severe headache; and prostration. Called also black, blue, or pinta f., blue disease, and tick-borne typhus. It is also known by many local names including Brazilian spotted, Choix, Colombian tick, or Tobia f., and São Paulo typhus.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| Rocky Mountain wood t. |
Dermacentor andersoni.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| Rock |
Another term for 'stone'
출처: www.anchoragecurling.com/terminology.htm
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| rocking |
The motion of a rose engine headstock when the edge of the rosette is used to cut circular waves on flat surfaces (face turning). See also Traversing.
출처: www.pledge.co.uk/ref/ch12c.htm
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| rock | a trough on rockers used by gold miners to shake earth in water in order to separate the gold |
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| rock | a chair mounted on rockers |
| rock | (British) a teenager or young adult in the 1960s who wore leather jackets and rode motorcycles |
| rock | a performer or composer or fan of rock music |
| rock | an attendant who rocks a child in a cradle |
| rock | a lever pivoted at the center |
| rock | originally a British youth subculture that evolved out of the teddy boys in the 1960s |
| rock | a garden featuring rocks |
| rock | a jet engine containing its own propellant and driven by reaction propulsion |
| rock | any vehicle propelled by a rocket engine |
| rock | sends a firework display high into the sky |
| rock | propels bright light high in the sky, or used to propel a lifesaving line or harpoon |