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<< Watermelon is the best for summertime, but is it actually a fruit? >>
No. Believe it or not, a watermellon is actually classified as a nut.
nik >>
Are you sure? I thought watermelon was classified as a berry. 
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The Encyclopaedia Britannica definition-
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(Citrullus lanatus, formerly C. vulgaris), succulent fruit of the gourd family (Cucurbitaceae), native to tropical Africa, but under cultivation on every continent except Antarctica. Its vines grow prostrate, with branched tendrils, deeply cut leaves, and flowers borne singly in the axil of a leaf. >>
and the definition of fruits in general
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Fruit - in its strict botanical sense, the fleshy or dry ripened ovary of a plant, enclosing the seed or seeds. Thus, apricots, bananas, and grapes, as well as bean pods, corn grains, tomatoes, cucumbers, and (in their shells) acorns and almonds, are all technically fruits.
This definition of fruit is very broad, and encompasses almost everything that contains seeds. >>
So technically I believe your both right

BTW, when doing the Google search I had a very funny hit on watermelon
Link just scroll to near the bottom of the page for the definition, it'll put watermelon in a different light for you
