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• frost
  frost

  noun

  a degree or state of coldness sufficient to cause the freezing of water.
• Frost
  Frost

  noun

  Robert (Lee), 1874–1963, U.S. poet.

frost

¹ American  

[frawst, frost] / frɔst, frɒst /

noun

1. a degree or state of coldness sufficient to cause the freezing of water.

2. Also called hoarfrost.  a covering of minute ice needles, formed from the atmosphere at night upon the ground and exposed objects when they have cooled by radiation below the dew point, and when the dew point is below the freezing point.

3. an opaque coating of tiny, white, granular ice particles, formed on the walls or contents of a freezer by the condensation of water vapor; rime.

4. the act or process of freezing.

5. coldness of manner or temperament.

   We noticed a definite frost in his greeting.

   Synonyms:

   reserve, distance, indifference, aloofness

6. Informal. a coolness between persons.

7. Informal. something that meets with lack of enthusiasm, as a theatrical performance or party; failure; flop.

8. a milkshake, frappe, or similar drink.

   a chocolate frost.

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verb (used with object)

1. to cover with frost.

2. to give a frostlike surface to (glass, metal, etc.).

3. to ice (a cake, cookies, etc.).

4. to bleach selected strands of (a person's hair) in order to create highlights.

5. to kill or injure by frost.

   a freezing rain that badly frosted the tomato plants.

6. to make angry.

   I was frosted by his critical comment.

verb (used without object)

1. to become covered with frost (often followed by up orover ).

   The windshield has frosted over.

2. (of varnish, paint, etc.) to dry with a film resembling frost.

idioms

1. degree of frost, the degree of temperature Fahrenheit below the freezing point.

   10 degrees of frost is equivalent to 22°F.

Frost ² American  

[frawst, frost] / frɔst, frɒst /

noun

1. Robert (Lee), 1874–1963, U.S. poet.

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frost ¹ British  

/ frɒst /

noun

1. a white deposit of ice particles, esp one formed on objects out of doors at night See also hoarfrost

2. an atmospheric temperature of below freezing point, characterized by the production of this deposit

3. degrees below freezing point: eight degrees of frost indicates a temperature of either –8°C or 24°F

4. informal something given a cold reception; failure

5. informal coolness of manner

6. the act of freezing

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verb

1. to cover or be covered with frost

2. (tr) to give a frostlike appearance to (glass, etc), as by means of a fine-grained surface

3. (tr) to decorate (cakes, etc) with icing or frosting

4. (tr) to kill or damage (crops, etc) with frost

Frost ² British  

/ frɒst /

noun

1. Sir David ( Paradine ). born 1939, British television presenter and executive, noted esp for political interviews

2. Robert ( Lee ). 1874–1963, US poet, noted for his lyrical verse on country life in New England. His books include A Boy's Will (1913), North of Boston (1914), and New Hampshire (1923)

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frost Scientific  

/ frôst /

1. A deposit of tiny, white ice crystals on a surface. Frost forms through sublimation, when water vapor in the air condenses at a temperature below freezing. It gets its white color from tiny air bubbles trapped in the ice crystals.

2. See more at dew point

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Other Word Forms

• frostless
  adjective
• frostlike
  adjective
• unfrost
  verb (used with object)

Etymology

Origin of frost

First recorded before 900; Middle English, Old English frost, forst; cognate with Old Saxon, Old High German, Old Norse frost; akin to freeze

Explanation

Frost is a thin, icy coating that forms on very cold, damp nights. During a New England winter, you'll have to scrape frost off your car windshield almost every morning. Frost is made of tiny crystals of ice that appear white and tend to form on windows, the ground, trees, and cars. While frost can be lovely on a window, with its snowflake shapes and patterns, it can also be dangerous for farm crops if it forms unexpectedly early or late in the year. Frost comes directly from the Old English, and it has a Proto-Germanic root.

Example Sentences

Gardeners and growers across the northern half of the UK will then need to be on alert on Saturday night as a frost is possible.

From BBC • May 9, 2026

The results provide the first clear evidence that mini-Neptunes can form beyond a star's "frost line," the distance at which temperatures are low enough for water to freeze into ice.

From Science Daily • May 7, 2026

The frost problem having been dealt with, the arrow was pointing straight up.

From Slate • Apr. 20, 2026

The film lives in its details — frost creeping along the walls, carbon dioxide levels rising, improvised fixes worked out step by step — as each small success only leads to the next crisis.

From Los Angeles Times • Mar. 19, 2026

The second root goes to the realm of the frost giants, to the well that belongs to Mimir.

From "Norse Mythology" by Neil Gaiman