having to do with osmosis (the passage of a liquid through a membrane from a less concentrated solution to a more concentrated one). this causes the more concentrated solution to become diluted, and makes the concentrations in both solutions more equal. osmotic also refers to a type of laxative that increases the amount of water in the large intestine, which softens the stool to help it pass more easily.
出典:Wiktionary
osmotic (not comparable)