Etymology
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fructify (v.)
mid-14c., "bear fruit," from Old French fructifiier "bear fruit, grow, develop" (12c.), from Late Latin fructificare "bear fruit," from Latin fructus "fruit, crops; profit, enjoyment" (from PIE root *bhrug- "to enjoy," with derivatives referring to agricultural products) + combining form of facere "to make, do" (from PIE root *dhe- "to set, put"). Transitive use from 1580s. Related: Fructified; fructifying; fructification.
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*bhrug- 
*bhrūg-, Proto-Indo-European root meaning "to enjoy," with derivatives referring to agricultural products.

It forms all or part of: brook (v.) "to endure;" defunct; fructify; fructose; frugal; fruit; fruitcake; fruitful; fruition; fruitless; frumentaceous; function; fungible; perfunctory; tutti-frutti; usufruct.

It is the hypothetical source of/evidence for its existence is provided by: Latin frui "to use, enjoy," fructus "an enjoyment, proceeds, fruit, crops;" Old English brucan "use, enjoy, possess," German brauchen "to use."
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