decidua is a topic covered in the Taber's Medical Dictionary.

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(di-sij′oo-ă )

(di-sij′oo-ē″ )

pl. deciduae [L. deciduus, falling off]
The endometrium or lining of the uterus and the tissue around the ectopically located fertilized ovum, e.g., in the fallopian tube or peritoneal cavity. The decidua has an interior compact layer and a surface spongy layer. The vasculature, glands, and interstitial cells of the endometrium undergo marked hypertrophy during pregnancy.
decidual (di-sij′oo-ăl ), adj.

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