Definitions
There is 1 meaning of the phrase
Silybum Marianum.
Silybum Marianum - as a noun
Tall old world biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in california and south america
Synonyms (Exact Relations)
blessed thistleholy thistlelady's thistlemilk thistleour lady's mild thistle