noni UK /ˈnəʊni/US /ˈnoʊni/ noun2 •The Polynesian fruit tree Morinda citrifolia. •The fruit of Morinda citrifolia, or a juice made from this fruit that is purported to have healthful qualitiesI'm wondering if the claims you hear about the so-called miracle antioxidants – including goji, açai and noni – are true. — 2009 formsnonis