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Noun: variolisation
Usage: Brit (N. Amer: variolization)
  1. The obsolete process of inoculating a susceptible person with material taken from a vesicle of a person who has smallpox
    "variolisation was a precursor to modern vaccination techniques";
    - variolation, variolization

Derived forms: variolisations

Type of: inoculating, vaccinating