Hydrophobic

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The term hydrophobic (hydro="water", phobic="fearing") is used to describe molecules that will not interact with water. Such molecules can also be known as lipophilic (fat-loving). Hydrophobic molecules are usually neutral and non-polar and so will not dissolve in polar solvents such as water [1]. Instead, hydrophobic molecules are inclined to group together to avoid associating with water [2]. This is a key feature in the phospholipid bilayers [3] of cell membranes. Examples of hydrophobic substances include fats, oils and alkanes. 

References

  1. Bruce Alberts, Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts, Peter Walter, (2008) Molecular Biology of the Cell, 5th edition, Page 620, New York: Garland Science
  2. Jeremy M. Berg, John L. Tymoczko, Lubert Stryer (2007), Biochemistry 6th Edition, Page 28, New York: W. H. Freeman and Company
  3. Bruce Alberts, Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts, Peter Walter, (2008) Molecular Biology of the Cell, 5th edition, Page 620, New York: Garland Science