The tissue lining the uterus that thickens during pregnancy and is shed after childbirth; the specialized uterine lining that supports the developing embryo.
From the Latin 'deciduus' (falling off), as this tissue is shed or 'falls away' after pregnancy. The term was coined by anatomists to describe this naturally shed membrane.
The decidua is literally named after falling because it's tissue your body deliberately sheds after a baby is born—one of the few times our bodies intentionally discard something that served a vital function!
Decidua (from Latin 'deciduus'—falling off) names the uterine tissue shed after pregnancy. The term is anatomically neutral, but obstetrics historically marginalized women's knowledge about their own bodies, with male physicians controlling terminology and medical authority over reproduction.
Use medically precise; pair with inclusive patient communication acknowledging that pregnant people deserve full explanation and bodily autonomy in discussing decidual tissue and birth outcomes.
Midwifery traditions held generational knowledge of pregnancy and birth before medical professionalization. Credit birth workers and mothers as co-knowers of reproductive biology alongside clinical medicine.
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