olive oil, oil extracted from the fleshy part of the ripened fruit of the olive tree, Olea europaea. Olive oil varies in color from clear yellow to golden; some varieties obtained from unripe fruit have a greenish tinge.

olive oil, oil extracted from the fleshy part of the ripened fruit of the olive tree, Olea europaea. Olive oil varies in color from clear yellow to golden; some varieties obtained from unripe fruit have a greenish tinge.