Definition: From the Greek (hydros) "water" and (phobos) "fear", a molecule that is hydrophobic does not "like" water - is repelled by water. Oils and fats are common hydrophobic molecules.
Soap molecules have one side that is hydrophilic and one side that is hydrophobic which allows it to bond with and dissolve in both water and oils - which is why soap helps the water clean better. One end sticks to the water, and the other end sticks to the oils/grease that you want to clean off.
Also Known As: Lipophillic - "oil/fat" "friendly"
