Citation, DOI, disclosures and article data
Citation:
Weerakkody Y, Luong D, Bell D, Second trimester. Reference article, Radiopaedia.org (Accessed on 25 Mar 2025) https://doi.org/10.53347/rID-86286
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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1. Bethune M, Alibrahim E, Davies B, Yong E. A pictorial guide for the second trimester ultrasound. (2013) Australasian journal of ultrasound in medicine. 16 (3): 98-113. doi:10.1002/j.2205-0140.2013.tb00106.x - Pubmed
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2. Seshadri Suresh, Indrani Suresh. The Second Trimester Obstetric Scan (7 + 3 = 10): A Rational Approach (Including the “Rule of Three”). (2014) Journal of Fetal Medicine. 1 (2): 59. doi:10.1007/s40556-014-0019-6
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3. Robert K. Barnhart, Sol Steinmetz. Chambers Dictionary of Etymology. (1999) ISBN: 9780550142306
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