
Freezing rain is the name given to rain that falls when surface temperatures are below freezing. Unlike a mixture of rain and snow, ice pellets (both of which are sometimes called `sleet`), or hail, freezing rain is made entirely of liquid droplets. The raindrops become supercooled while passing through a sub-freezing layer of air many hundreds .....
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http://en.wikipedia.org/wiki/Freezing_rain

Rain which falls as liquid then freezes upon impact, resulting in a coating of ice on exposed objects.
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http://ggweather.com/glossary.htm

(from the article `climate`) When raindrops fall through a cold layer of air (colder than 0 °C, or 32 °F) and become supercooled, freezing rain occurs. The drops may freeze on ...
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http://www.britannica.com/eb/a-z/f/60

Rain that freezes on objects such as trees, cars and roads, forming a coating or glaze of ice. Temperatures at higher levels are warm enough for rain to form, but surface temperatures are below 32 degrees Fahrenheit, causing the rain to freeze on impact.
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http://www.encyclo.co.uk/local/22268

Liquid water droplets with a temperature below 0 deg. C (supercooled) that turn to ice when they hit a cold surface.
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http://www.metcheck.com/OTHER/glossary.asp

A type of precipitation. Occurs when liquid rain hits a cold surface and then immediately freezes into ice. For this to occur, a surface temperature inversion is usually required. In such an inversion, the surface must have a temperature below freezing, while the temperature of the atmosphere where the precipitation forms is above freezing.
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http://www.physicalgeography.net/physgeoglos/f.html

Rain which falls as liquid then freezes upon impact of a surface, resulting in a coating of ice on exposed objects.
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http://www.stormfax.com/wxwords.htm

Rain that freezes on objects such as trees, cars and roads, forming a coating or glaze of ice. Temperatures at higher levels are warm enough for rain to form, but surface temperatures are below 32 degrees Fahrenheit, causing the rain to freeze on impact. In Canada, freezing rain is described to occur when the air temperature is below zero Celsius n...
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http://www.timeanddate.com/weather/glossary.html

rain, the drops of which freeze on impact with the ground or with objects on the earth's surface or with aircraft in flight.
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https://nsidc.org/cryosphere/glossary?page=9

Rain that falls as liquid drops but freezes upon impact with horizontal or vertical surfaces. Freezing rain is characterized as either glaze or rime depending on the nature of the ice. Rain may freeze on the surface because its drops are supercooled and freeze on contact or that the surface is well below freezing. Technically, only the former is co...
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https://www.encyclo.co.uk/local/21131

Rain that falls in liquid form and then freezes upon impact with the ground or an item with a temperature of 32 degrees Fahrenheit or less, possibly producing a thin coating of ice. Even in small amounts, freezing rain can cause traveling problems. Large amounts can pull down power lines and tree branches.
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https://www.encyclo.co.uk/local/22280

rain that falls as a liquid but freezes into glaze upon contact with the ground.
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https://www.infoplease.com/dictionary/freezing-rain
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