Charles Heiser
Definition.com
Vegetable is a word with no precise botanical meaning — almost all parts of plants have been employed as vegetables - roots (carrot and beet), stems (Irish potato and asparagus), leaves (spinach and lettuce), leaf stalk (celery and Swiss chard), bracts (globe artichoke), flower stalks and buds (broccoli and cauliflower), fruits (tomato and squash), seeds (beans), and even the petals (Yucca and pumpkin).