D defs.my
Entry 4 senses Webster, 1913

eruption

/ērˌ-ŭp'-shən/ · e·rup·tion · IPA /ɪˈɹʌpʃən/
01 n. The act of breaking out or bursting forth;
  1. 1.
    The act of breaking out or bursting forth;
    “All Paris was quiet . . . to gather fresh strength for the next day's eruption.” W. Irving.
  2. 2.
    That which bursts forth.
  3. 3.
    A violent exclamation; ejaculation.
    “He would . . . break out into bitter and passionate eruditions.” Sir H. Wotton.
  4. 4.
    The breaking out of pimples, or an efflorescence, as in measles, scarlatina, etc.(Med.)