(1) (physics) (chemistry) Lacking an affinity for water; insoluble in water; repelling water.

(2) Of, or having hydrophobia (literally, the fear of or water).


Examples of hydrophobic molecules include the alkanes, oils, fats, and greasy substances in general.

Word origin: Attic Greek hydro- for water and phobos for fear.

Related forms: hydrophobicity (noun), hydrophobe (noun).

Compare: hydrophilic.

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