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"nutrient" is also used as a crossword clue. If that's what you saw, the answer is often protein (7 letters).
Definitions
any substance that can be metabolized by an animal to give energy and build tissue
Word origin
Borrowed from Latin nūtriēns, present participle of nūtriō (“to suckle, nourish, foster”).
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Nourishing substance”8 letters
02“Food substance”8 letters
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