eruption
noun
erup·tion
i-ˈrəp-shən 
1
a
: an act, process, or instance of erupting
b
: the breaking out of a rash on the skin or mucous membrane
2
: a product of erupting (such as a skin rash)
Examples of eruption in a Sentence
a great eruption of glee as it suddenly dawned on her that she had won
the eruption of the volcano Krakatoa was one of the most violent in global history
Recent Examples on the Web
On July 9, USGS said the most recent eruption had ended.
—
Elizabeth Weise, USA Today, 14 July 2025
It is believed that in most cases, the eruption completely destroys the white dwarf.
—Robert Lea, Space.com, 2 July 2025
But at what point do these emotional eruptions become abusive or signal one’s failure in communicating with others?
—Kyndall Cunningham, Vox, 29 June 2025
Some experts consider sun poisoning to be any illness or allergic reaction caused by UV exposure, such as polymorphous light eruption (PMLE).13
People with PMLE experience an inflammatory reaction to sunlight, resulting in a rash and, in some cases, fever or headache.
—Sarah Bradley, Health, 20 June 2025
See All Example Sentences for eruption
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Elizabeth Weise, USA Today, 14 July 2025
It is believed that in most cases, the eruption completely destroys the white dwarf.
—Robert Lea, Space.com, 2 July 2025
But at what point do these emotional eruptions become abusive or signal one’s failure in communicating with others?
—Kyndall Cunningham, Vox, 29 June 2025
Some experts consider sun poisoning to be any illness or allergic reaction caused by UV exposure, such as polymorphous light eruption (PMLE).13
People with PMLE experience an inflammatory reaction to sunlight, resulting in a rash and, in some cases, fever or headache.
—Sarah Bradley, Health, 20 June 2025
See All Example Sentences for eruption
Cite this Entry
“Eruption.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/eruption. Accessed 19 Jul. 2025.
Copy CitationKids Definition
eruption
noun
erup·tion
i-ˈrəp-shən
1
: an act, process, or instance of erupting
2
: a product (as a skin rash) of erupting
Medical Definition
eruption
noun
erup·tion
i-ˈrəp-shən
1
: an act, process, or instance of erupting
the eruption of the tooth from the gum
specifically
: the breaking out of an exanthem or enanthem on the skin or mucous membrane (as in measles)
2
: something produced by an act or process of erupting: as
a
: the condition of the skin or mucous membrane caused by erupting
b
: one of the lesions (as a pustule) constituting this condition
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