Eruption

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late Middle English: from Old French, or from Latin eruptio(n- ), from the verb erumpere (see erupt).

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From Middle French éruption, from Latin eruptio

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eruption (n.)

early 15c., erupcioun, from Old French éruption (14c.) and directly from Latin eruptionem (nominative eruptio) "a breaking out," noun of action from past-participle stem of erumpere "break out, burst forth," from assimilated form of ex "out" (see ex-) + rumpere "to break, rupture" (see rupture (n.)).