The Collaborative International Dictionary of English v.0.48:
Fleawort \Flea"wort`\, n. (Bot.) An herb used in medicine (Plantago Psyllium), named from the shape of its seeds. --Loudon. [1913 Webster]WordNet (r) 3.0 (2006):
Plantago psyllium n 1: plantain of Mediterranean regions whose seeds swell and become gelatinous when moist and are used as a mild laxative [syn: fleawort, psyllium, Spanish psyllium, Plantago psyllium]