Definitions

1. adjective

relating to or resembling the decidua, a membrane formed in the uterus during pregnancy

“The decidual cells played a crucial role in the implantation of the embryo.”

2. adjective

shedding or falling off, especially in a regular or seasonal manner, like the deciduous leaves of a tree

“The deciduous trees in the forest displayed a brilliant display of autumn colors before shedding their leaves.”