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Definition of morning sickness noun from the Oxford Advanced Learner's Dictionary

morning sickness

noun
 
/ˈmɔːnɪŋ sɪknəs/
 
/ˈmɔːrnɪŋ sɪknəs/
[uncountable]
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  1. the need to vomit that some women feel, often only in the morning, when they are pregnant, especially in the first monthsTopics Life stagesc2
See morning sickness in the Oxford Advanced American Dictionary
trait
noun
 
 
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