Definition of "oily" in English

adjective

1. Covered with or containing oil.

   • oily machinery;   oily rags;   oily fish;   oily cooking

2. Resembling oil.

   • oily swells;   oily seas

3. (figuratively) Excessively friendly or polite but insincere.

   • Near-synonyms: slick, buttery; smarmy

noun

1. A marble with an oily lustre.

2. (in the plural, informal) Oilskins. (waterproof garment)