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oil·y / ˈoilē/ • adj. (oil·i·er, oil·i·est) 1. containing oil: oily fish such as mackerel and sardines. ∎  covered or soaked with oil: an oily rag. ∎  resembling oil in appearance or behavior: the oily swell of the river.2. fig. (of a person or their behavior) unpleasantly smooth and ingratiating: his oily smile.DERIVATIVES: oil·i·ness n.

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