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Any of various plants of the genus Sonchus of the composite family, native to Eurasia and Africa but widespread as weeds, having prickly leaves, milky sap, and yellow flower heads.
(Plants) any of various plants of the Old World genus Sonchus, esp S. oleraceus, having milky juice, prickly leaves, and heads of yellow flowers: family Asteraceae (composites). Also called: milk thistle, puha (NZ) or rauriki (NZ)
[C13: from sugethistel, perhaps variant of Old English thugethistel, thuthistel thowthistle, a dialect name of the sow thistle. See sow2, thistle]
any composite plant belonging to the genus Sonchus, esp. S. oleraceus, a weed having thistlelike leaves, yellow flowers, and a milky juice.
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|Noun||1.||sow thistle - any of several Old World coarse prickly-leaved shrubs and subshrubs having milky juice and yellow flowers; widely naturalized; often noxious weeds in cultivated soil|
Sonchus oleraceus, milkweed - annual Eurasian sow thistle with soft spiny leaves and rayed yellow flower heads