Rift Valley fever
— Navneord
– Engelsk
~ an infection common in Africa caused by a bunyavirus; transmitted by mosquitoes or by handling infected animals
rift valley
— Navneord
– Engelsk
~ a valley with steep sides; formed by a rift in the earth's crust
Ruhr Valley
— Navneord
– Engelsk
~ a major industrial and coal mining region in the valley of the Ruhr river in northwestern Germany
relief valve
— Navneord
– Engelsk
~ a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level
rectifying valve
— Navneord
– Engelsk
~ a thermionic tube having two electrodes; used as a rectifier
right atrioventricular valve
— Navneord
– Engelsk
~ valve with three cusps; situated between the right atrium and the right ventricle; allows blood to pass from atrium to ventricle and closes to prevent backflow when the ventricle contracts