trimester マイ単語帳に追加

三半期

a period of three months; especially one of the three three-month periods into which human pregnancy is divided.

3ヶ月間。特に人間の妊娠期間が分けられる3つの3ヵ月の期間の一つ。

三半期

one of three divisions of an academic year.

学年の3分の1。