Second trimester

Last revised by David Luong on 12 Jul 2021

The second trimester in a gestation is the middle trimester in a human pregnancy that is usually defined as lasting from 13 weeks and 0 days to 27 weeks and 6 days of gestation. 

History and etymology

Trimester was first seen in English in 1821, a direct borrowing from the French word trimestre, itself introduced from the Latin word 'trimestris' meaning three months, which is derived from the Latin roots, 'tri-' meaning three and 'mensis' meaning month 3.

See also

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