| 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...
|
|---|---|
| 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...
|
| Rocky Mountain wood t. |
Dermacentor andersoni.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
|
| Rock |
Another term for 'stone'
출처: www.anchoragecurling.com/terminology.htm
|
| 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
|