Plantain/ˈplant(e)ɪn/nounA plant of the genus Plantago, with a rosette of sessile leaves about 10 cm long with a narrow part instead of a petiole, and with a spike inflorescence with the flower spacing varying widely among the species. See also psyllium.Synonyms: fleawort, waybread🔗 Explore synonyms & relationships🌍 See word origin & history