to increase the proportion of a valuable mineral or isotope in (a substance or material): The fuel was enriched with uranium 235 for the nuclear reactor.
7.
Nutrition.
a.
to restore to (a food) a nutrient that has been lost during an early stage of processing: to enrich flour with thiamine, iron, niacin, and riboflavin.
b.
to add vitamins and minerals to (food) to enhance its nutritive value.
late 14c., "to make wealthy," from O.Fr. enrichir, from en- "make, put in" + riche "rich" (see rich). Scientific sense of "to increase the abundance of a particular isotope in some material" is first attested 1945. Related: Enriched; enriching.