Dictionary

All Word
roadman Noun a salesman who travels to call on customers
road mender Noun a workman who is employed to repair roads
roarer Noun someone who communicates vocally in a very loud voice
robber Noun a thief who steals from someone by threatening violence
robbery suspect Noun someone suspected of committing robbery
ravisher Noun a very attractive or seductive looking woman
ravisher Noun someone who assaults others sexually
rooter Noun an enthusiastic devotee of sports
ratifier Noun someone who expresses strong approval
railroader Noun an employee of a railroad
railroad man Noun an employee of a railroad
railwayman Noun an employee of a railroad
railway man Noun an employee of a railroad
reprover Noun someone who finds fault or imputes blame
reproacher Noun someone who finds fault or imputes blame
rebuker Noun someone who finds fault or imputes blame
rouser Noun someone who rouses others from sleep
roamer Noun someone who leads a wandering unsettled life
rhabdomancer Noun someone who uses a divining rod to find underground water
rube Noun a person who is not very intelligent or interested in culture
ray of light Noun a column of light (as from a beacon)
rest energy Noun the energy equivalent to the mass of a particle at rest in an inertial frame of reference
repulsive force Noun the force by which bodies repel one another
resting potential Noun the potential difference between the two sides of the membrane of a nerve cell when the cell is not conducting an impulse
radiation pressure Noun the minute pressure exerted on a surface normal to the direction of propagation of a wave
rocket propulsion Noun reaction propulsion using stored oxygen for combustion
reaction propulsion Noun propulsion that results from the ejection at high velocity of a mass of gas to which the vehicle reacts with an equal and opposite momentum
radiant energy Noun energy that is transmitted in the form of (electromagnetic) radiation
radio wave Noun an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
radio emission Noun an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
radio radiation Noun an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
radio signal Noun a radio wave used to transmit and receive messages
radio spectrum Noun the entire spectrum of electromagnetic frequencies used for communications
radio-frequency spectrum Noun the entire spectrum of electromagnetic frequencies used for communications
rainfall Noun water falling in drops from vapor condensed in the atmosphere
raindrop Noun a drop of rain
rainstorm Noun a storm with rain
reverse lightning Noun atmospheric discharges (lasting 10 msec) bursting from the tops of giant storm clouds in blue cones that widen as they flash upward
red sprites Noun atmospheric electricity (lasting 10 msec) appearing as globular flashes of red (pink to blood-red) light rising to heights of 60 miles (sometimes seen together with elves)
rain shower Noun a brief period of precipitation
radiation field Noun a field that represents the energy lost from the radiator to space
radiopacity Noun opacity to X-rays or other radiation
resistivity Noun a material's opposition to the flow of electric current
radio-opacity Noun opacity to X-rays or other radiation
resolving power Noun the ability of a microscope or telescope to measure the angular separation of images that are close together
red shift Noun a shift in the electromagnetic radiation of a distant object toward longer wavelengths, the red end of the spectrum
redshift Noun (astronomy) a shift in the spectra of very distant galaxies toward longer wavelengths (toward the red end of the spectrum)
roentgen ray Noun electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
reactance Noun opposition to the flow of electric current resulting from inductance and capacitance (rather than resistance)
retarding force Noun the phenomenon of resistance to motion through a fluid