first trimester

/fərst ˌˈtraɪˌˈmɛstər/
IPA guide

Definitions of first trimester
  1. noun
    time period extending from the first day of the last menstrual period through 12 weeks of gestation
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    type of:
    trimester
    a period of three months; especially one of the three three-month periods into which human pregnancy is divided
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