• (n.) A species of plantain (Plantago lanceolata) with long, narrow, ribbed leaves; -- called also rib grass, ripple grass, ribwort plantain. Found on http://thinkexist.com/dictionary/meaning/ribwort/
(from the article `Plantago`) The greater plantain (Plantago major) provides seed spikes for bird food. Ribwort and hoary plantain (P. lanceolata and P. media, respectively) are ... Found on http://www.britannica.com/eb/a-z/r/45
Rib'wort` noun (Botany) A species of plantain ( Plantago lanceolata ) with long, narrow, ribbed leaves; -- called also rib grass , ripple grass , ribwort plantain . Found on http://www.encyclo.co.uk/webster/R/79