psyllium

Not to be confused with Cilium. For the mucilaginous health product, see Psyllium seed husks. Psyllium or Ispaghula is the common name used for several members of the plant genus Plantago whose seeds are used commercially for the production of mucilage.
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Psyllium /psyl·li·um/ 1. a plant of the genus Plantago. 2. the husk or seed of various species of Plantago ; used as a bulk-forming laxative. [more]Psyllium - Community and Resources

Noun
1. plantain of Mediterranean regions whose seeds swell and become gelatinous when moist and are used as a mild laxative
(synonym) fleawort, Spanish psyllium, Plantago psyllium
(hypernym) plantain

n. psyllium

A plantain seed.