Real Dictionary

membrane
a ratio of two expressions or numbers other than zero [...]
a sensory nerve ending that changes specific stimuli into nerve impulses [...]
adherence to moral principles; honesty [...]
any of a large group of nitrogenous compounds of high molecular weight that are essential constituents of all living organisms. They consist of one or more chains of amino acids linked by peptide bonds and are folded into a specific three-dimensional shap
any of a large group of organic compounds that are esters of fatty acids ( simple lipids, such as fats and waxes) or closely related substances (compound lipids, such as phospholipids): usually insoluble in water but soluble in alcohol and other organic s
any small sac or cavity, esp one containing serous fluid [...]
any thin pliable sheet of material [...]
latent but unrealized ability or capacity [...]
the act of conducting trade or business, esp of an illicit kind [...]
the act or process of fusing or melting together; union [...]
the state of being fluid [...]
the state or quality of being permeable [...]
to make or become local in attitude, behaviour, etc [...]
to undergo or cause to undergo a loss of polarity or polarization [...]
countable noun: A membrane is a thin piece of skin which connects or covers parts of a person's or animal's body.