purgative
词根词缀：
expurgate v. 删除
ex 使… + purg 纯洁；变干净 + ate 做，造成，使… → 变干净 → 删除
impure adj. 不纯的
im 不 + pure 纯的；纯洁的 → 不纯的
impurity n. 不纯；有罪
im 不 + purity 纯净 → 不纯；有罪
pure adj. 纯的；纯洁的
purgation n. 清洗
purg 纯洁；变干净 + ation 行为，过程，状态，结果 → 使干净 → 清洗
purgative adj. 清洗的
purg 纯洁；变干净 + ative 有…倾向（性质）的，属于…的 → 清洗的
purgative n. 泻药
purge v. 使清净
purify v. 使清洁；使纯正
pur 纯洁；变干净 + ify 使… → 使纯洁
purist n. 纯粹主义者
pur 纯洁；变干净 + ist 信仰某种信仰、主义的人 → 纯粹主义者
purity n. 纯净
pur 纯洁；变干净 + ity 具备某种性质，状况 → 纯净
unpurged adj. 未净化的
un 没有 + purg 纯洁；变干净 + ed 表形容词 → 未净化的
数据来源：新东方英语词汇速记大全
相关例句：
The doctors attempted to reduce his high fever by inducing diarrhea with a purgative.
医生们尝试用通便药物催泻以使他退烧。
Impact of antipyretic and purgative herbs on intestinal mucosal barrier and inflammatory response in treatment of acute cholangitis in rats
清热通下中药对胆管炎大鼠肠屏障保护和炎症反应调控的研究
The purgative experiments of SC ⅰ and SC ⅱ;
决明子SCⅠ、SCⅡ的通便实验；
Objective: To find satisfactory purgative drug for the treatment of constipation of elderly patients with fracture.
目的：探讨治疗老年骨折患者便秘的最佳药物和剂量。
Results: The purgative activity of the extracts by the three technologies was SFE-CO2& residue resin purification> solvent extraction> SFE-CO2. Conclusion: Extracting different polar components separately might get a good result.
结果：各工艺产物泻下活性的强弱为：SFE-CO2及药渣树脂精制工艺组>溶剂工艺组>SFE-CO2组。结论：分极性提取效果较好。
The aether extracts of SC ⅰ had better purgative effect, but waved greatly and had short period.
SCⅠ乙醚提取物的通便效果较好，但波动起伏较大，且波动周期短；