Peanut/ˈpiːnʌt/ Definition 1 of 3Pro Tip 1/3Not a Tree Nut Unlike some nuts, peanuts grow underground and are legumes, similar to beans and lentils. You'll find peanuts in the ground, not on trees. Pro Tip 2/3Allergy Awareness Peanut allergies are common and can be severe, so always check before offering peanuts to others. Is anyone allergic to peanuts in this group? Pro Tip 3/3Popular Snack Peanuts are often eaten as snacks and used in various cuisines, especially in Asian and American dishes. Peanuts are a common topping for pad thai.