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hydrophobic

American  
[hahy-druh-foh-bik] / ˌhaɪ drəˈfoʊ bɪk /

adjective

  1. of or relating to hydrophobia.

  2. Chemistry. having little or no affinity for water.


hydrophobic British  
/ ˌhaɪdrəˈfəʊbɪk /

adjective

  1. of or relating to hydrophobia

  2. chem tending not to dissolve in, mix with, or be wetted by water Compare hydrophilic

    a hydrophobic colloid

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • hydrophobicity noun
  • nonhydrophobic adjective

Etymology

Origin of hydrophobic

First recorded in 1640–50; hydrophobe + -ic

Vocabulary lists containing hydrophobic

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"By contrast, small-molecule drugs that are designed to cross the blood-brain barrier are hydrophobic in nature, which limits their bioavailability, increases the risk of off-target binding, and is linked to side effects."

From Science Daily • Nov. 6, 2025

In their study published in Cell Reports Physical Science, the researchers also tried to understand the specific interactions that occur between hydrophobic components and proteins and their impact on protein aggregation.

From Science Daily • May 30, 2024

Backholm expects these findings will further enable physicists and engineers to develop hydrophobic surfaces with better performance.

From Science Daily • Apr. 16, 2024

They know that it can be very effective as a hydrophobic, self-cleaning coating, but it's only now they realise how important the structure is for visible coloration.

From Science Daily • Feb. 7, 2024

This makes me feel positively hydrophobic toward Caspian; but all the same I'll remember what you say, and not be "precipitate"—one of your favourite words: follows you about like a dog!

From The Lightning Conductor Discovers America by Williamson, C. N. (Charles Norris)