No, an orange is not a vegetable. An orange is a fruit. Fruits are the mature ovaries of flowering plants, typically containing seeds. Oranges, like other citrus fruits, develop from the ovary of the orange blossom and contain seeds, which classify them as fruits.
Vegetables, on the other hand, are other parts of the plant, such as roots, stems, leaves, and flowers. Examples of vegetables include carrots (roots), celery (stems), spinach (leaves), and broccoli (flowers).
So, while both fruits and vegetables are essential parts of a healthy diet, they are botanically different. Oranges fall into the fruit category due to their seed-bearing structure and development from the ovary of a flower.