melon means “melon” | MotiTan French Dictionary

More examples

J'achète un melon au marché.

I buy a melon at the market.

A firm-skinned fruit opened to reveal a mass of juicy flesh and seeds.

pastèque: A large fruit with green skin and juicy red flesh.
fruit: The edible fruit produced by a plant.

Fruit comestible, arrondi ou légèrement allongé, à chair sucrée et juteuse, souvent consommé frais en été.

The noun entered French from Italian melone, which goes back through Latin melopepo to Greek mēlopepōn.

Avoir le melon is an idiom meaning 'to be conceited', not a reference to eating the fruit.