Definition of "nasturtium"

nasturtium

/nasˈtɜːʃəm/

noun
plural nasturtiums or nasturtia
1. The popular name of any of the plants in the Tropaeolum genus of flowering plants native to south and central America.
  Quotations
  To me a nasturtium by the river brink is more than a simple flower. It is a broader, grander, more magnificent, more stupendous symbol. It may mean anything, everything—such as sunsets and conflagrations and Götterdämmerungs!
  1915, Robert W. Chambers, “Un Peu d'Amour”, in Police!!!‎
  Drenched were the cold fuchsias, round pearls of dew lay on the flat nasturtium leaves.
  1922, Katherine Mansfield [pseudonym; Kathleen Mansfield Murry], “At the Bay”, in The Garden Party, London: Constable & Company, page 1
2. A plant in this genus, garden nasturtium (Tropaeolum majus).
3. Any of the plants in the genus Nasturtium that includes watercress.