The word you're looking for is hydrophilic. A hydrophilic molecule is one that readily dissolves in water. This is because hydrophilic molecules are polar, meaning they have a positive and negative end, like a magnet. Water is also a polar molecule, and the positive end of a water molecule will attract the negative end of a hydrophilic molecule, and vice versa. This attraction helps the hydrophilic molecule dissolve in water.

Here are some examples of hydrophilic molecules:

* Sugar (glucose)

* Salt (sodium chloride)

* Ethanol

* Many proteins

Let me know if you have any other questions.