Simple past tense and past participle of deregister.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "deregistered" in a sentence
"The South African Department of Trade and Industry has thrown its weight behind the fight to have the rooibos name deregistered in the US."
""In contrast, about five per cent of our fleet has been voluntarily deregistered, which is generally in line with car rental industry standards," he said."
"Last November the Center for Responsive Politics and OMBWatch reported that 1,418 lobbyists "deregistered" during the second quarter of 2009, a huge spike in numbers and an unintended consequence of President Obama's anti-lobbyist policies and rhetoric -- lobbying going underground."