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[ih-ruhpt] /ɪˈrʌpt/
verb (used without object)
to burst forth:
Molten lava erupted from the top of the volcano.
Synonyms: vent.
(of a volcano, geyser, etc.) to eject matter.
to break out of a pent-up state, usually in a sudden and violent manner:
Words of anger erupted from her.
to break out in a skin rash:
Hives erupted all over his face and hands.
(of teeth) to grow through surrounding hard and soft tissues and become visible in the mouth.
verb (used with object)
to release violently; burst forth with:
She erupted angry words.
Synonyms: vent.
(of a volcano, geyser, etc.) to eject (matter).
Origin of erupt
1650-60; < Latin ēruptus burst forth, broken out (past participle of ērumpere), equivalent to ē- e-1 + ruptus, past participle of rumpere to break, rupture
Related forms
eruptible, adjective
preerupt, verb (used without object)
reerupt, verb (used without object)
unerupted, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for unerupted


to eject (steam, water, and volcanic material such as lava and ash) violently or (of volcanic material, etc) to be so ejected
(intransitive) (of a skin blemish) to appear on the skin; break out
(intransitive) (of a tooth) to emerge through the gum and become visible during the normal process of tooth development
(intransitive) to burst forth suddenly and violently, as from restraint: to erupt in anger
Derived Forms
eruptible, adjective
eruption, noun
Word Origin
C17: from Latin ēruptus having burst forth, from ērumpere, from rumpere to burst
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
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Word Origin and History for unerupted



1650s, of diseases, etc., from Latin eruptus, past participle of erumpere "to break out, burst" (see eruption). Of volcanoes, from 1770. Related: Erupted; erupting.

Online Etymology Dictionary, © 2010 Douglas Harper
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unerupted in Medicine

erupt e·rupt (ĭ-rŭpt')
v. e·rupt·ed, e·rupt·ing, e·rupts

  1. To break through the gums in developing. Used of teeth.

  2. To appear on the skin. Used of a rash or blemish.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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