sow thistle

(sou)
n.
Any of various plants of the genus Sonchus, especially S. oleraceus of Eurasia, having prickly leaves and rayed, yellow flower heads.

A wild plant (Sonchus oleraceus); the young leaves can be used in salads, and the roots can be roasted or boiled, and eaten in the same way as salsify. Also known as milk weed or hare's lettuce.

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The noun has one meaning:

Meaning #1: 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
  Synonym: milk thistle

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