LATIN DICTIONARYLexicon Latīnum
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“eruption” in Latin

The English word eruption itself goes back to Latin ēruptiō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

eruption
eruptio (e.g., of Etna; also hostile incursion, sally): initium: principium (beginning, e.g., of a war): On the eruption of the war, bello erumpente; bello exorto.
Incursion, invasion, Vid:
Breaking out, scabies (general term): lepra (leprosy): mentagra, mentigo (on the chin): eruptio capitis: porrigo (on the head): pustulae (heat-spots, pustules). To be covered with an eruption, scabie, pustulis, etc., infici.

Quick answer

What is the Latin word for eruption?
The usual Latin words for “eruption” are ēruptiō, initium, prī̆nceps; also scabiēs, lepra, mentāgra. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.