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  1. Dictionary
    hoar frost
    /ˈhɔːfrɒst/

    noun

    • 1. a greyish-white crystalline deposit of frozen water vapour formed in clear still weather on vegetation, fences, etc.

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  2. www.britannica.com › science › hoarfrostHoarfrost | Formation, Deposition, Sublimation | Britannica

    Hoarfrost, deposit of ice crystals on objects exposed to the free air, such as grass blades, tree branches, or leaves. It is formed by direct condensation of water vapour to ice at temperatures below freezing and occurs when air is brought to its frost point by cooling.

  3. www.accuweather.com › en › weather-newsWhat is hoarfrost? - AccuWeather

    The term "hoarfrost" is derived from the Old English meaning of frost resembling an old man's beard. With the exception of those who have never ventured out of the tropics, most...

  4. www.rmets.org › metmatters › how-does-hoar-frost-formHow does hoar frost form? | Royal Meteorological Society

    Nov 30, 2016 · Hoar frost forms when water vapour in the air comes into contact with an object that is below freezing. Rather than the water vapour first condensing onto the object and then freezing, the water vapour immediately freezes to form ice crystals.

  5. www.metoffice.gov.uk › weather › learn-aboutWhat is frost? - Met Office

    Hoar frost. Hoar frost is composed of tiny ice crystals and is formed by the same process as dew, but when the temperature of the surface is below freezing point. The 'feathery'...

  6. www.merriam-webster.com › dictionary › hoarfrostHoarfrost Definition & Meaning - Merriam-Webster

    noun. hoar· frost ˈhȯr-ˌfrȯst. Synonyms of hoarfrost. : frost sense 1b. Synonyms. frost. hoar. rime. See all Synonyms & Antonyms in Thesaurus. Examples of hoarfrost in a Sentence. the hoarfrost formed a delicate swirly pattern on the window.

  7. weather.com › science › weather-explainersHoarfrost: The Science Behind Frost on Steroids

    Oct 20, 2015 · No, this frost isn't on performance-enhancing drugs. What you see in the photos above is called hoarfrost. The first photo shows an early-season example of hoarfrost from Oct. 19,...

  8. www.wisfarmer.com › whats-difference-between-rime-ice-and-hoar-frost › 6553534002What's the difference between Rime Ice and Hoar Frost?

    Jan 5, 2021 · Hoar Frost. According to the National Weather Service, hoar frost is defined as a "deposit of interlocking crystals formed by direct sublimation on objects, usually those of small diameter freely exposed to air, such as tree branches, plants, wires, poles, etc."

  9. nsidc.org › learn › cryosphere-glossaryhoarfrost | National Snow and Ice Data Center

    hoarfrost. a deposit of interlocking ice crystals (hoar crystals) formed by direct sublimation on objects, usually those of small diameter freely exposed to the air, such as tree branches, plant stems and leaf edges, wires, poles, etc.; the surfaces of these objects are sufficiently cooled, mostly by nocturnal radiation, to cause the direct ...

  10. dictionary.cambridge.org › dictionary › englishHOARFROST | English meaning - Cambridge Dictionary

    HOARFROST definition: 1. a white layer of pieces of ice like needles that forms on objects outside when it is very cold…. Learn more.

  11. dictionary.cambridge.org › us › dictionaryHOARFROST | definition in the Cambridge English Dictionary

    hoarfrost meaning: 1. a white layer of pieces of ice like needles that forms on objects outside when it is very cold…. Learn more.