|a very large molecule, as a colloidal particle, protein, or esp. a polymer, composed of hundreds or thousands of atoms.|
|the period of the cell cycle during which the nucleus is not undergoing division, typically occurring between mitotic or meiotic divisions.|
|osmosis (ɒzˈməʊsɪs, ɒs-)|
|1.||the passage of a solvent through a semipermeable membrane from a less concentrated to a more concentrated solution until both solutions are of the same concentration|
|2.||diffusion through any membrane or porous barrier, as in dialysis|
|3.||gradual or unconscious assimilation or adoption, as of ideas|
|[C19: Latinized form from |
osmosis os·mo·sis (ŏz-mō'sĭs, ŏs-)
n. pl. os·mo·ses (-sēz)
Diffusion of fluid through a semipermeable membrane until there is an equal concentration of fluid on both sides of the membrane.
The tendency of fluids to diffuse in such a manner.
|osmosis (ŏz-mō'sĭs) Pronunciation Key
(click for larger image in new window)
The movement of a solvent through a membrane separating two solutions of different concentrations. The solvent from the side of weaker concentration usually moves to the side of the stronger concentration, diluting it, until the concentrations of the solutions are equal on both sides of the membrane. ◇ The pressure exerted by the molecules of the solvent on the membrane they pass through is called osmotic pressure. Osmotic pressure is the energy driving osmosis and is important for living organisms because it allows water and nutrients dissolved in water to pass through cell membranes.
Note: Informally, “osmosis” is the process by which information or concepts come to a person without conscious effort: “Living in Paris, he learned French slang by osmosis.”