English to English Dictionary

Radio Astronomy

The branch of astronomy that studies celestial bodies by means of the radio waves they emit.

Railroad

A track made of steel rails along which trains run.

Rainforest

A luxuriant, dense forest rich in biodiversity, found typically in tropical areas with consistently heavy rainfall.

Ram

An uncastrated adult male sheep.

Rant

A long, angry speech of complaint or accusation.

Raptor

A bird of prey, such as an eagle, hawk, falcon, or owl, characterized by hooked bills and sharp talons.

Raster

A rectangular pattern of parallel scanning lines on a television screen or computer monitor that form a displayed image.

Ratio

The quantitative relation between two amounts showing the number of times one value contains or is contained within the other.

Raw data

Data that has not been processed, cleaned, formatted, or analyzed since its collection.

Razor

A sharp-edged instrument used for shaving off hair.

Reactive

Showing a response to a stimulus, situation, or event rather than acting proactively.

Rear-window

The glass window located at the back of a motor vehicle, enabling the driver to see traffic or objects behind them.