Modifiers matching membrane:

• extracellular,
• active,
• biological,
• moist,
• resonant,
• logical,
• protective,
• internal,
• impermeable,
• cellular,
• proteinaceous,
• intact,
• flexible,
• elastic,
• impervious,
• collagenous,
• epithelial,
• excitable,
• inorganic,
• fetal,
• continuous,
• thick,
• waterproof,
• multicellular,
• heterogeneous,
• mucous,
• vascular,
• mucosal,
• thin,
• permeable,
• porous,
• synthetic,
• natural,
• intracellular,
• nonporous,
• imperforate,
• refractory,
• biologic,
• metallic,
• sensitive,
• pliable,
• warm,
• macromolecular,
• circular,
• homogeneous,

Simple categories matching multicellular:

• eukaryote,
• organization,
• organism,
• invertebrate,
• arrangement,
• aggregate,
• tissue,
• mammal,
• microorganism,
• group,
• entity,
• animal,
• structure,
• activity,
• parasite,
• plant,
• system,
• membrane,
• host,
• network,
• lumen,
• fungus,
• organ,
• process,
• creature,
• organs,
• object,
• body,