prolific - Dictionary definition and meaning for word prolific
"Production Lifted"--> They produced large amounts of the product = Their production was lifted up in amount = They were PROLIFIC.
PROLIFIC is PROFITic. (profitable, because of high yield)
prolific ~ pro (production) + life; now try to relate meaning of prolific with 'production of life'.
Pro(good) + lific(life) >>> a person lives Pro life when he/she is highly intellectual and productive in every sense...