Definition of nasturtium noun from the Oxford Advanced Learner's Dictionary

 

nasturtium

 noun
noun
BrE BrE//ˈstɜːʃəm//
 
; NAmE NAmE//ˈstɜːrʃəm//
 
 
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a garden plant with round flat leaves and red, orange or yellow flowers that are sometimes eaten in salads Word Origin Old English (originally denoting any plant of the cabbage family of the genus Nasturtium, including watercress): from Latin, apparently from naris ‘nose’ + torquere ‘to twist’.
See the Oxford Advanced American Dictionary entry: nasturtium