Hypotonic solution: A solution with a lower concentration than in normal cells of the body and the blood.
It appears there may have been a typo in your question. There is no term "hyphotonic" in the English language. If you could provide more context or clarify, I would be happy to help!
When the solute concentration is lower in the environment than in the cell, the cell is in a hypotonic solution. Water will move into the cell through osmosis because of the concentration gradient, potentially causing the cell to swell or burst.