Permeable. A permeable membrane is a biological or synthetic material that has tiny holes in it, allowing small particles (including water molecules and ions) to move through it. See more. Definition: Permeability refers to the ease with which molecules cross biological membranes. Find 11 ways to say permeable, along with antonyms, related words, and example sentences at Thesaurus.com, the world's most trusted free thesaurus. What does permeable mean? permeable membrane: A membrane that permits passage of water and certain substances in solution. A perfect membrane hasn't any permeability, but the majority of all biological membranes are selectively or semi- permeable, allowing the selective passage of particular compounds, like the movement of nutrients through a cell membrane. Permeant. Overview of Permeable Definition. Permeability is the property of the cell or plasma membrane. The definition of permeable is a material that allows liquids or gases to pass through. Impermeant. Selective permeability is the property by which the cell membranes allow only certain molecules to enter or exit the cell. noun. Small polar molecules can sometimes pass easily (e.g. It is unanimously accepted that permeability of any specific molecule depends mainly on charge number, polarity, size, and to some extent, to the molar mass of the molecule. It may also refer to the ease with which ions or molecules pass through the pore of channel proteins. ethanol), but more often pass at low rates if at all (e.g. the state of being permeable to dissolved compounds, liquids, or gases. Permeable definition, capable of being permeated. The permeability of a membrane can be defined as the passive diffusion rate of permeated molecules across the biomembrane. Permeability definition, the property or state of being permeable. A pure phospholipid bilayer, whatever the lipid composition, is a semi-permeable membrane that is generally repellent to large molecules and to ions. water). See more. Permeability, capacity of a porous material for transmitting a fluid; it is expressed as the velocity with which a fluid of specified viscosity, under the influence of a given pressure, passes through a sample having a certain cross section and thickness. Impermeable. See: osmosis ; selectively permeable membrane ; semipermeable membrane See also: membrane
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