自動零位器
Nullifier \Nul"li*fi`er\, n. One who nullifies or makes void; one who maintains the right to nullify a contract by one of the parties.
nullifier
n 1: an advocate of nullification; someone who believes that a
state can resist federal laws
2: an official who can invalidate or nullify; "my bank check
was voided and I wanted to know who the invalidator was"
[syn: {invalidator}, {voider}]