Vegetable or Fruit?

I thought tomato belongs to the vegetable catagory, but someone challenge that today. So I searched online for awhile and came across this posting:

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Is a tomato a fruit? According to the dictionary it is!
to·mato: soft juicy red or yellow fruit eaten raw or cooked as a vegetable.

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What exactly is a fruit?
fruit: fleshy, seed-bearing part of a plant used as food; quantity of these.

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Why isn't the tomato a vegetable?
ve·get·able: part of various types of plants eaten as food.

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http://www.kdcomm.net/~tomato/debate.htm

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But the funniest argument is that "it was classified this way in 1893 by the Supreme Court for trade reasons (imposing import taxes to protect growers)!" :)