sə̇ˈrōsə, -ōzə noun
( plural serosas -əz ; also sero·sae -ˌsē, -ˌzē)
Etymology: New Latin, from feminine of serosus serous, from Latin serum + -osus -ous
1.
a. : chorion 1
b. : a comparable membrane of blastodermic origin that encloses the embryo of many insects and other arthropods
2. : a serous membrane ; specifically : the outermost delicate layer of serous connective tissue and mesothelial cells that encloses an organ or lines a bodily cavity