From Longman Dictionary of Contemporary Englishtrimestertri‧mes‧ter /trɪˈmestə $ traɪˈmestər/ noun [countable] 1 American EnglishSE one of three periods of equal length that the school year is divided into SYN term British English2 MBone of the three-month periods of pregnancy
Examples from the Corpus
trimester• Abortions after the first trimester cost considerably more than those within the first twelve weeks.• Coelocentesis may be suitable for prenatal diagnosis in the first trimester.• She may even concede that hospitalisation is best, at least for the last trimester.• Preeclampsia is a potentially fatal condition that usually strikes in the last trimester of pregnancy.• Somehow, even the dumbest pregnancy cliches seem appealing in your second trimester.• They also observed a maternal hypoglycaemic response in their subjects in the third trimester.• As pregnancy progresses, the placenta secretes more progesterone which peaks midway into the third trimester and then levels off.• Athletes who have trained normally through the first two trimesters have delivered normal babies. 4.Origin trimester (1800-1900) French trimestre, from Latin trimestris, from tri- “three” + mensis “month” 