c. 1300, of trees, from fruit + -ful. Related: Fruitfully; fruitfulness. Of animals or persons from early 16c.; of immaterial things from 1530s.
be fruitful and multiply
frugal
frugality
frugivorous
fruit
fruitcake
fruitful
fruition
fruitless
fruity
frumbierdling
frumentaceous
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