DECIDUA

decidua

(noun) the epithelial tissue of the endometrium

Source: WordNet® 3.1

Etymology

Noun

decidua (plural deciduas or deciduae)

(anatomy) A mucous membrane that lines the uterus and is shed during menstruation and modified during pregnancy

Source: Wiktionary

De*cid"u*a, n. Etym: [NL., fr. L. deciduus. See Deciduous.] (Anat.)

Definition: The inner layer of the wall of the uterus, which envelops the embryo, forms a part of the placenta, and is discharged with it.

Source: Webster’s Unabridged Dictionary 1913 Edition