frost

[frawst, frost]
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noun

verb (used with object)

verb (used without object)

to become covered with frost or freeze (often followed by up or over): The windshield has frosted over.
(of varnish, paint, etc.) to dry with a film resembling frost.

Idioms

    degree of frost, British. the degree of temperature Fahrenheit below the freezing point: 10 degrees of frost is equivalent to 22°F.

Origin of frost

before 900; Middle English, Old English frost, forst; cognate with Old Saxon, Old High German, Old Norse frost; akin to freeze
Related formsfrost·less, adjectivefrost·like, adjectiveun·frost, verb (used with object)

Synonyms for frost

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for unfrost

Frost

noun

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

frost

noun

a white deposit of ice particles, esp one formed on objects out of doors at nightSee also hoarfrost
an atmospheric temperature of below freezing point, characterized by the production of this deposit
degrees below freezing point: eight degrees of frost indicates a temperature of either –8°C or 24°F
informal something given a cold reception; failure
informal coolness of manner
the act of freezing

verb

to cover or be covered with frost
(tr) to give a frostlike appearance to (glass, etc), as by means of a fine-grained surface
(tr) mainly US and Canadian to decorate (cakes, etc) with icing or frosting
(tr) to kill or damage (crops, etc) with frost
Derived Formsfrostlike, adjective

Word Origin for frost

Old English frost; related to Old Norse, Old Saxon, Old High German frost; see freeze
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unfrost

frost

n.

Old English forst, frost "a freezing, becoming frozen, extreme cold," from Proto-Germanic *frusta- (cf. Old Saxon, Old Frisian, Old High German frost, Middle Dutch and Dutch vorst), related to freosan "to freeze," from PIE *preus- "to freeze; burn" (see freeze (v.)). Both forms of the word were common in English till late 15c.; the triumph of frost may be due to its similarity to the forms in other Germanic languages.

frost

v.

1630s, from frost (n.). Related: Frosted; frosting.

Online Etymology Dictionary, © 2010 Douglas Harper

unfrost in Medicine

frost

[frôst]

n.

A deposit of minute ice crystals formed when water vapor condenses at a temperature below freezing.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

unfrost in Science

frost

[frôst]

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. See more at dew point.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.