RFD is an abbreviation that can refer to:
Rural Free Delivery, the postal system to rural areas started in the Great DepressionRequest for Discussion, a
Usenet formal process for making changes
Radio frequency (device/detector/distribution), one of several acronyms
Mayberry R.F.D., a CBS television sitcom
Chicago/Rockford International Airport (IATA airport code: RFD), an airport in northern Illinois
Razorfen Downs, a World of Warcraft instance for the Horde
RFD (magazine), a magazine for rural gay menRecency Frequency Duration, a modified version on the RFM analysis
The RFD Boys, a bluegrass band from Ann Arbor, Michigan
Rear flank downdraft, an area of quickly descending air associated with strong thunderstormsRegistered Firearms Dealer (United Kingdom)
RFD-TV, a television network
Reserve Force Decoration, an Australian Military AwardR.F.D. Washington, a restaurant/bar in Washington D.C.Red Flag Deals, an online Canadian bargain hunting community
Railfreight Distribution, an old UK freight company.
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The RfD is a numerical estimate of a daily oral exposure to the human population, including sensitive subgroups such as children, that is not likely to cause harmful effects during a lifetime. RfDs are generally used for health effects that are thought to have a threshold or low dose limit for producing effects.
(or RFD) - A region of dry air subsiding on the back side of, and wrapping around, a
mesocyclone . It often is visible as a
clear slot wrapping around the wall cloud. Scattered large precipitation particles (rain and hail) at the interface between the clear slot and
wall cloud may show up on radar as a
hook or
pendant ; thus the presence of a hook or pendant may indicate the presence of an RFD. See
supercell .
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