Fruit or Vegetable?
 

Okay, so I learned today that pumpkins (or any kind of squash) are actually fruits, not vegetables. For some reason I've always thought of them as vegetables. Then I was reminded of the trick that I use to tell vegetable from fruit: if it has a seed in it, then it's a fruit. If not, then it's a vegetable. Is this accurate?

So...
pomegranate = fruit
avocado = fruit
potato = vegetable(?)
radish = vegetable

So would a tomato be a fruit or vegetable?

How about coconuts? Would this be a fruit? vegetable? nut? or what? (heh, that rhymed)

There must be a better way to go about this. Know any tips?

Direct from Dictionary.com:
A fruit is actually the sweet, ripened ovary or ovaries of a seed-bearing plant. A vegetable, in contrast, is an herbaceous plant cultivated for an edible part (seeds, roots, stems, leaves, bulbs, tubers, or nonsweet fruits). So, to be really nitpicky, a fruit could be a vegetable, but a vegetable could not be a fruit.
The Nutriquest team offers a similar answer, adding that most fruits are sweet because they contain a simple sugar called fructose, while most vegetables are less sweet because they have much less fructose. The sweetness of fruit encourages animals to eat it and thereby spread the seeds. The site also presents an interesting list of fruits that are often thought to be vegetables:

tomatoes
cucumbers
squashes and zucchini
avocados
green, red, and yellow peppers
peapods
pumpkins
But hey, what about the nut? Well, according to our friends at The Straight Dope, a nut is actually a "a dry, one-seeded, usually oily fruit."
Potato potahto, tomato tomahto, let's call the whole thing off.

Peapods... whodathunkit?

Okay, so what about coconuts? IIRC, a coconut has no seed(s), so I guess it's considered a vegetable? And does that mean that coconut milk is really vegetable juice? Horrors!

Here's my deffinition that solves all the confusion: If there is a starbust flavor for it, it's a fruit. Meaning tomatoes, pumpkins, pickles, cucumbers, peppers, they are all veges.
I don't go with the dictionary, I go with my mouth.