/ Thesaurus / M Synonyms of milk thistle Find synonyms for: Noun1. sow thistle, milk thistle, shrub, bushusage: any of several Old World coarse prickly-leaved shrubs and subshrubs having milky juice and yellow flowers; widely naturalized; often noxious weeds in cultivated soil2. milk thistle, lady's thistle, Our Lady's mild thistle, holy thistle, blessed thistle, Silybum marianum, herb, herbaceous plantusage: tall Old World biennial thistle with large clasping white-blotched leaves and purple flower heads; naturalized in California and South AmericaWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language