種痘 [种－]

Jyutping zung2 dau6
Pinyin zhòng dòu

Definitions (Wiktionary)
  1. verb
    to vaccinate against smallpox
    (syn.) 种牛痘, 種珠, 种珠, 點痘子, 種汞, 種花, 種牛痘, 点痘子, 种花, 种汞