An eruption is an explosion of steam and lava from a volcano. This word is also used for other explosions, such as "an eruption of emotions."

If there's an eruption of a volcano, you don't want to be anywhere near it. When a volcano erupts, it spews a huge amount of lava, ash, and steam into the air. If you were angry at a friend but held your tongue for a long time, then suddenly started yelling in anger, that's an eruption too. The sudden spreading of a disease could be called an eruption. Eruptions are quick, huge, explosive, and dangerous: they're never good news.

Definitions of eruption
  1. noun
    the sudden occurrence of a violent discharge of steam and volcanic material
    synonyms: volcanic eruption
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    Plinian eruption
    a volcanic eruption in which a stream of gas and ash is violently ejected to a height of several miles
    type of:
    the sudden giving off of energy
  2. noun
    (of volcanos) pouring out fumes or lava (or a deposit so formed)
    synonyms: eructation, extravasation
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    type of:
    action, activeness, activity
    the state of being active
  3. noun
    symptom consisting of a breaking out and becoming visible
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    Kaposi's varicelliform eruption, eczema vaccinatum
    a now rare complication of vaccinia superimposed on atopic dermatitis with high fever and generalized vesicles and papulovesicles
    enanthem, enanthema
    eruption on a mucous membrane (as the inside of the mouth) occurring as a symptom of a disease
    exanthem, exanthema, skin eruption
    eruption on the skin occurring as a symptom of a disease
    efflorescence, rash, roseola, skin rash
    any red eruption of the skin
    heat rash, miliaria, prickly heat
    obstruction of the sweat ducts during high heat and humidity
    hives, nettle rash, urticaria, urtication
    an itchy skin eruption characterized by weals with pale interiors and well-defined red margins; usually the result of an allergic response to insect bites or food or drugs
    type of:
    (medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease
  4. noun
    the emergence of a tooth as it breaks through the gum
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    type of:
    egress, emergence, issue
    the becoming visible
  5. noun
    a sudden violent spontaneous occurrence (usually of some undesirable condition)
    synonyms: epidemic, irruption, outbreak
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    a widespread outbreak of an infectious disease; many people are infected at the same time
    a return of something after a period of abatement
    an epidemic that is geographically widespread; occurring throughout a region or even throughout the world
    type of:
    happening, natural event, occurrence, occurrent
    an event that happens
  6. noun
    a sudden very loud noise
    synonyms: bam, bang, blast, clap
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    water hammer
    the banging sound of steam in pipes
    type of:
    sound of any kind (especially unintelligible or dissonant sound)
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