vegetable oil
Synonym discussion
Sense: noun/1
Vegetable oil is a broad everyday term for edible oils that come from plants. Cooking oil is even wider, because it can also be used when a speaker is not thinking about the source very carefully. Olive oil and canola oil are more specific names for particular kinds of vegetable oil, so they sound better when the recipe depends on flavour or texture. If a label simply says vegetable oil, it usually means a general kitchen oil rather than one named variety. A recipe might ask for vegetable oil to fry onions, but call for olive oil when the dressing should have a stronger taste.
Etymology
This English phrase joins vegetable, meaning relating to plants, with oil. Together they describe an edible oil taken from plant sources rather than from animal fat or petroleum.
First known use
1765
1765, in the meaning defined above