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MMR

noun [S]
 
 
/ˌemˌemˈɑːr/ US  /-ˈɑːr/

Definition

an injection given to young children to protect them against the illnesses measles, mumps, and rubellaImmunology and vaccination
(Definition of MMR noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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