1DT covered with oil :
He wiped his hands on an oily rag.
He wiped his hands on an oily rag.2 similar to oil :
an oily liquid
an oily liquid3 oily hair or skin contains more natural oil than is usual or desirable [= greasy]:
a shampoo for oily hair
a shampoo for oily hair4 oily food contains a lot of oil or fat :
oily fish
oily fish5 someone who is oily is very polite, in a way that other people think is unpleasant and not sincere
—oiliness noun [uncountable]

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