Think you can tell a fruit from a vegetable?

Think again.

In the world of food, there are many plants most people consider vegetables that are actually fruits, botanically speaking.

The most famous example is probably the tomato. Its status as a fruit or a vegetable was so contentious that in 1893 the Supreme Court had to weigh in and settle the issue once and for all.

What it comes down to isn't sweetness, but seeds. "Any thing that grows on a plant and is the means by which that plant gets its seeds out into the world is a fruit," Merriam-Webster dictionary wrote.

So fruit isn't part of the plant itself, but a reproductive part growing from the plant. "The thing a tomato plant produces isn't a part of the plant itself, any more than the egg a chicken lays is part of the chicken," the dictionary said. When we eat vegetables, on the other hand, we're eating the plant itself or some of its parts, like roots, stems, or leaves.

Tomatoes are far from the only example of common vegetables that are actually fruits. Read on to see 14 foods you've been misunderstanding this whole time.

Tomatoes

Even though tomatoes are technically a fruit, it doesn't stop people from treating it and most of the other foods on this list as a vegetable.

It's that logic that prompted the Supreme Court to declare in 1893 that tomatoes should be taxed like other vegetables.

Here's how Justice Horace Gray summed up the argument:

"Botanically speaking, tomatoes are the fruit of a vine, just as are cucumbers, squashes, beans, and peas," Gray wrote in the court's opinion.

"But in the common language of the people … all these are vegetables which are grown in kitchen gardens, and which, whether eaten cooked or raw, are, like potatoes, carrots, parsnips, turnips, beets, cauliflower, cabbage, celery, and lettuce, usually served at dinner in, with, or after the soup, fish, or meats which constitute the principal part of the repast, and not, like fruits generally, as dessert."

Peppers

Every kind of pepper, from the bell pepper to the jalapeño, fits the bill as a fruit and not a vegetable.

Pumpkins

Anyone who's carved a jack-o-lantern for Halloween knows that pumpkins are full of seeds. Pumpkins and all other gourds are technically fruits, not vegetables.

Cucumbers

Speaking of gourds, cucumbers are an unexpected member of that family, too. Will you ever look at pickles the same way again?

Peas

Technically, peas aren't the fruit here, but the pods are. That's because they contain the seeds — the peas — that the plant uses to reproduce.

String beans

That's right, one of America's favorite vegetables is really a fruit in disguise.

Eggplant

Not only are eggplants fruits, they're technically classified as a berry.

Okra

Packed with fiber, potassium, and vitamin C, okra is one of the most nutritious fruits out there.

Olives

You probably don't think of olives as a fruit, but that's exactly what they are. Specifically, they're considered a stone fruit, like peaches, mangoes, and dates.

Avocados

Although it doesn't seem like a fruit, avocados are actually single-seeded berries.

Corn

Corn is treated like a grain in agriculture and like a vegetable in the kitchen. But scientifically, neither of those categories are right.

Those kernels are the seeds that corn plants use to reproduce, so that qualifies corn as a dry fruit.

Zucchini

Zucchinis are a member of the gourd family, meaning just like cucumbers and pumpkins, they're considered a type of berry.

Beans

Just like peas, beans are a member of the legume family — they're seeds that come in pods, and that makes them fruit.

Chickpeas

Another common legume is chickpeas or garbanzo beans. We usually don't see them inside their pods, but chickpeas are classified the same way as peas and beans.

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