invalidator

英[ɪn'vælɪdeɪtɜː] 美[ɪn'vælɪdeɪtɜː]
  • n.使无效者
  • and conj.和;加;接着;那么
  • null adj.无效的;无价值的;无效力的n.零;空vt.使无效
  • void adj.空的;无效的;缺乏的n.真空;空白;空虚vt.使无效;排泄;使空出vi.排泄
Noun:
  1. an official who can invalidate or nullify;

    "my bank check was voided and I wanted to know who the invalidator was"