First Known Use: 1544
Dictionary
1fog
noun \ˈfȯg, fäg\
: many small drops of water floating in the air above the ground, the sea, etc.
: a state of mental confusion
Full Definition of FOG
1
a : vapor condensed to fine particles of water suspended in the lower atmosphere that differs from cloud only in being near the ground b : a fine spray or a foam for firefighting
2
: a murky condition of the atmosphere or a substance causing it
3
a : a state of confusion or bewilderment <spent the morning in a fog> b : something that confuses or obscures <hid behind a fog of rhetoric>
4
: cloudiness or partial opacity in a developed photographic image caused by chemical action or stray radiation
— fog·less \-ləs\ adjective
See fog defined for English-language learners
See fog defined for kids
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Origin of FOG
probably back-formation from foggy
2fog
verb
: to cover or fill (something) with small drops of water : to make (something) foggy
: to become foggy
: to make (someone or something) confused
foggedfog·ging
Full Definition of FOG
transitive verb
1
: to cover, envelop, or suffuse with or as if with fog <fog the barns with pesticide>
2
: to make obscure or confusing <accusations which fogged the real issues>
3
: to make confused
4
: to produce fog on (as a photographic film) during development
intransitive verb
1
: to become covered or thick with fog
2
a : to become blurred by a covering of fog or mist b : to become indistinct through exposure to light or radiation
See fog defined for English-language learners
First Known Use of FOG
1599
Related to FOG
- Antonyms
- clarify, clear (up), illuminate
FOG Defined for Kids
1fog
noun \ˈfȯg, ˈfäg\
Definition of FOG for Kids
1
: tiny drops of water floating in the air at or near the ground
2
: a confused state of mind <I woke up in a fog.>
2fog
verb
foggedfog·ging
Definition of FOG for Kids
: to cover or become covered with tiny drops of water <Steam from the shower fogged the mirror.>
Medical Dictionary
fog
transitive verb \ˈfäg, ˈfȯg\
foggedfog·ging
Medical Definition of FOG
: to blur (a visual field) with lenses that prevent a sharp focus in order to relax accommodation before testing vision
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