The term fruit can refer to any product of plant growth useful to humans or animals. However, the more specific definition is the “edible part of a plant developed from a flower, along with any accessory tissues”. Using this more specific definition, all fruits can be considered vegetables but not all vegetables can be considered fruit. Olives, plums, tomatoes, artichokes and cucumbers are fruit. Lettuce, potatoes, celery and beets are not reproductive parts of the plant developed from flowers so are considered vegetables. Interesting.