submembranous
/ˌsʌbˈmɛmbrənəs/adjective
1 Botany and Zoology = submembranaceous.
2 Medicine and Biology. Located or occurring (immediately) beneath a membrane, (in later use) especially the plasma membrane or other cellular membrane.
Origin
Late 18th century. From sub- + membranous. In sense 1 after scientific Latin submembranaceus submembranaceous.