psyllium

/S IH1 L IY0 AH0 M/
noun
  1. 1

    Any of several plants of the subgenus Plantago subg. Psyllium, whose seeds are used commercially for the production of mucilage and their laxative properties.

  2. 2

    Synonym of psyllium (seed) husk, especially as a dietary supplement

Source: https://en.wiktionary.org/wiki/psyllium