Earlier quoted context omitted.
Many people now know that a tomato is a fruit, and will distinguish it with exactly the 'did you know a tomato is not a vegetable?' fun fact, so I'm not sure this is a great point. If someone asked me to list vegetables and they were being rigorous about it I wouldn't list a tomato. If they're not being rigorous about it then anything goes really - sometimes you can put things like apples in a salad so that must be a…
A tomato is definitely a vegetable. Botanically, there are no such things as vegetables. The classification of a thing as a "vegetable" is strictly a culinary distinction. Cucumbers, tomatoes, apples, oranges, they're all the fruit of the plant, but the first two are culinarily classified as vegetables and the last two as fruits. Also, salad is a preparation method, specifically the chopping of ingredients and the ap…
In earlier centuries, "vegetable" still had mostly its original meaning taken from Latin, where "Vegetabilia", as used e.g. by Linnaeus for the "vegetabile regnum", referred to any living beings capable of growth, but incapable of motion, i.e. mainly to the terrestrial plants.
Strictly speaking, seeds, grains, nuts, fruits, roots, bulbs, leaves, stems, etc. are all parts of vegetables.
What in English is now called "vegetables" corresponds to the Latin word "holera", whose original meaning was "greens", and not at all with the Latin word "vegetabilia". Also English "fruits" does not correspond with Latin "fructa", but with Latin "poma". Latin "fructa" referred to the useful results of some activity, a sense still encountered more rarely in English.