Modifiers matching membrane:

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

Simple categories matching protective:

• clothing,
• nutrient,
• equipment,
• helmet,
• colloid,
• structure,
• shell,
• cloth,
• measure,
• antioxidant,
• item,
• skin,
• defence,
• armour,
• modification,
• characteristic,
• membrane,
• packing,
• protein,
• coat,
• coating,
• material,
• shelter,
• zone,
• matrix,
• phytochemical,
• lubricant,
• element,
• application,
• garment,
• security,
• apparel,
• surface,
• arrangement,
• fluid,
• practice,
• insulator,
• fence,
• group,
• polymer,
• case,
• ointment,
• wax,
• factor,
• plating,
• insect,
• market,
• foodstuff,
• hydrocolloid,
• guard,
• switch,
• oxide,
• siding,
• footwear,
• mask,
• property,
• layer,
• support,
• accessory,
• sugar,
• cushioning,
• elements,
• compound,
• paste,
• information,
• quality,
• defense,
• oil,
• agent,
• bag,
• behaviour,
• organization,
• envelope,
• enclosure,
• hardware,
• packaging,
• appliance,
• circuit,
• wrapping,
• article,
• instrument,
• antibody,
• component,
• construction,
• fat,
• habit,
• sheet,
• film,
• clothes,
• gear,
• particle,
• adult,
• shade,
• container,
• installation,
• chamber,
• means,
• brace,
• overclothes,
• service,
• area,
• procedure,
• mechanism,
• carrier,
• metal,
• constituent,
• tissue,
• food,
• relay,
• mattress,
• care,
• housing,
• mineral,
• institution,
• lotion,
• cell,
• works,
• closure,
• barrier,
• molecule,
• wrap,
• enzyme,
• action,
• seal,
• drug,
• garb,
• gel,
• process,
• tape,
• attire,
• pigment,
• charm,
• gadget,
• sediment,
• order,
• cover,
• behavior,
• hat,
• activity,
• border,
• outerwear,
• plate,
• line,
• headgear,
• feature,
• chemical,
• apparatus,
• agency,
• gas,
• conduit,
• placement,
• tree,
• part,
• substance,
• solute,
• glove,
• space,
• liquid,
• unit,
• diet,
• facility,
• device,
• atmosphere,
• package,
• system,
• product,
• devices,
• force,
• object,
• adhesive,
• fabric,
• herb,
• pad,
• modality,
• covering,