In this Article. In this Article. A solitary pulmonary nodule (SPN) is a single abnormality in the lung that is smaller than 3 cm in diameter. Generally, a pulmonary nodule must grow to at least 1 cm in diameter before it can be seen on a chest X-ray.
Osmosis is the scientific process of transferring fluid between molecules. When molecules move in and out of a cell to achieve the same concentration of something, like salt, on both sides, then osmosis is happening.
The noun OSMOSIS has 1 sense: 1. diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal.Familiarity information: OSMOSIS used as a noun is very rare.Dictionary entry details. â¢ OSMOSIS (noun).. diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal. Familiarity information: OSMOSIS used as a noun is very rare. Dictionary entry details. â¢ OSMOSIS (noun).