(botany) The seed-bearing part of a plant, often edible, colourful/colorful and fragrant, produced from a floral ovary after fertilization.
While cucumber is technically a fruit, one would not usually use it to make jam.
Any sweet, edible part of a plant that resembles seed-bearing fruit, even if it does not develop from a floral ovary; also used in a technically imprecise sense for some sweet or sweetish vegetables, such as rhubarb, that resemble a true fruit or are used in cookery as if they were a fruit.
Fruit salad is a simple way of making fruits into a dessert.
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1910, Canada Experimental Farms Service, Report of the Dominion Experimental Farms:
It may be said, however, that the percentage of green apples among the Fameuse seedlings is much less than among the others as out of 33 Fameuse seedlings which had fruited up to this year, none was green and we recollect but one light coloured Fameuse seedling fruiting this year.
1998, Randy Molina & David Pilz, Managing Forest Ecosystems to Conserve Fungus Diversity and Sustain Wild Mushroom Harvests, →ISBN, page 10:
For example, chanterelles and russulas can start fruiting in early to mid summer given sufficient moisture, but other species, such as matsutake, rarely fruit until temperatures cool in the autumn, even if moisture is available earlier.
2014, David Mitchell, The Bone Clocks, →ISBN, page 12:
The grass and weeds come up to my waist and the plum trees are already fruiting up, though most of the fruit'll go to the wasps and the worms, Vinny says, 'cause he can't be arsed to pick it.