isotonic solution

Pronunciation

Noun B2 Upper-intermediate

A solution that has the same solute concentration as the fluid inside a cell, so there's no net movement of water in or out.

"Doctors use an isotonic solution for intravenous drips so it won't cause red blood cells to swell or shrink."

Test yourself

Which word fits the gap? "Doctors use an _____ for intravenous drips so it won't cause red blood cells to swell or shrink."

Answer: isotonic solution

In your own words, what does "isotonic solution" mean?

A solution that has the same solute concentration as the fluid inside a cell, so there's no net movement of water in or out.