Having an osmolality less than another fluid, ordinarily assumed to be plasma or extracellular fluid. ... (05 Mar 2000) ... 
Type: Term Pronunciation: hī′pos-mot′ik Definitions: 1. Having an osmolality less than another fluid, ordinarily assumed to be plasma or extracellular fluid.
hypo-osmotic, hyposmotic 1. Containing a lower concentration of osmotically active components than a standard solution. 2. Having an osmolality less than another fluid, ordinarily assumed to be plasma or extracellular fluid