first trimester

1. 1.

   time period extending from the first day of the last menstrual period through 12 weeks of gestation

   Broadertrimester

Questions about first trimester

What does first trimester mean?

first trimester means "time period extending from the first day of the last menstrual period through 12 weeks of gestation".

Is first trimester a common word?

first trimester is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.