Entry 3 senses · 2 variants Webster, 1913 Nutrient /no͞ot'-rē-ənt/ · Nu·tri·ent · IPA /ˈnuː.tɹi.ənt/ a. n. 01 a. Nutritious; nourishing; promoting growth. 1. Nutritious; nourishing; promoting growth. 02 n. Any substance which has nutritious qualities, i. e., which nourishes or promotes growth; a nutriment. 1. Any substance which has nutritious qualities, i. e., which nourishes or promotes growth; a nutriment. 2. A substance added to the growth medium of a microorganism to promote growth.(Microbiology)