Per Wikipedia: “Vegetables are edible parts of plants that are consumed by humans or other animals as food. This original meaning is still commonly used, and is applied to plants collectively to refer to all edible plant matter, including flowers, fruits, stems, leaves, roots, and seeds.”
Relevant Smartypants episode: https://watch.dropout.tv/videos/birthdays-the-cookout-vegetables (dropout subscription required) 22m20s onwards for the relevant segment but that whole episode’s a banger