-l noun
also mem·bra·nel·la ˌ ̷ ̷ ̷ ̷ˈnelə
( plural membra·nelles | ̷ ̷ ̷ ̷|nelz ; also membranel·lae ˌ ̷ ̷ ̷ ̷ˈne(ˌ)lē, -eˌlī)
Etymology: New Latin membranella, diminutive of Latin membrana membrane — more at membrane
: a flattened vibrating organ like a membrane comprised of a row of fused cilia in various ciliates