ectoplasm
noun [ U ] uk/ˈek.tə.plæz.əm/ us/ˈek.toʊ.plæz.əm/
biology specialized（细胞外层的）外质
the outer layer of particular types of cell
（某些人认为围绕鬼魂等的）灵的外质
a substance that is believed to surround ghosts and other creatures that are connected with spiritual activities