The passage of gases or liquids through a membrane from areas of different concentrations, especially the movement of substances in opposite directions simultaneously.
From Greek 'dia-' (through) + 'osmosis' (the pushing or thrusting movement of liquids). The term was coined in the 19th century to describe bidirectional diffusion through semipermeable membranes, extending the concept of osmosis.
Scientists studying how kidneys filter blood and how plants absorb water discovered diosmosis was happening in both directions at once—the body isn't just pushing water out, it's also carefully pulling in nutrients through the same membrane at the same time!
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