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invalidated

 [in-val-i-deyt]  

in·val·i·date

   [in-val-i-deyt]
verb (used with object), -dat·ed, -dat·ing.
1.
to render invalid; discredit.
2.
to deprive of legal force or efficacy; nullify.
Origin:
1640–50; invalid2 + -ate1

Related forms
in·val·i·da·tion, noun
in·val·i·da·tor, noun

Synonyms
1. weaken, impair; disprove, refute, rebut.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Invalidated is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a scrap or morsel of food left at a meal.
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WordNet
invalidated

adjective
deprived of legal force 
WordNet® 3.0, © 2006 by Princeton University.
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