(1) (used of solutions) Of or having the same or equal osmotic pressure.
(2) A condition in which the total number of solutes (i.e. permeable and impermeable) in a solution is the same or equal to the total solutes in another solution.
Word origin: G. isos, equal + osmotic: relating to osmosis.
Related forms: isosmotically (adverb).
Related phrases: isosmotic solution.
Alternative forms: isoosmotic, iso-osmotic.
Compare: hyposmotic, hyperosmotic.
See also: osmosis, osmotic pressure.