Etymology
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hydrophobic (adj.)

1807, from hydrophobia + -ic.

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Definitions of hydrophobic

hydrophobic (adj.)
lacking affinity for water; tending to repel and not absorb water; tending not to dissolve in or mix with or be wetted by water;
hydrophobic (adj.)
abnormally afraid of water;
Synonyms: aquaphobic
From wordnet.princeton.edu