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.

• 任何属于东半球的粗糙的多刺的叶子的灌木和半灌木，有乳状的汁和黄色的花；被广泛移植，在耕种的土壤中通常有有害的杂草。