词根：empt, em(eem, mpt, m, anson), ampl = to take, to buy

  词根em来自拉丁语的emere意为to take，其变形为eem,mpt,m,ansom,ampl,empt等，同义词根有来自拉丁语的prehend/prehens,pris,cap/capt/cept/ceiv(cip,cup,ceit),rap/rav,sum/sumpt,lab/lep等。

  词根em 可以追溯到原始印欧语根*em-，它最原始的含义是"to take（去拿）"人们买东西就要去拿，所以，词根em就衍生出了buy （买东西的含义） 这层含义。
 
  （*拉丁文emere(=to take,to buy) —— 英文字根字典）

同源词：

1. exemplary（抓向外边的、举例的ex(=out) + em(=take)）
  adj.模范的，典范的；惩戒性的，警告性的
  exemplify v.例证；作为榜样
  exemplification n.例证；范例，实例
  exempligratia n.例如（缩写：eg）
  He was named valedictorian for his exemplary academic performance. 他因优异的学习成绩而被选为毕业生代表。

2. impromptu（不提前抓im<in(=not) + pro(=before) + mpt<ept(=take)）
  adj./adv. 无准备的（地），即兴的（地）
  n. 即席之作（如演奏、作诗等）
  We had an impromptu party in the dorm the day after finals.期末考试结束后的第二天，我们在宿舍临时开了一个晚会。

3. peremptory（采取强硬态度的per(=intensive) + empt(=take)）
  adj.（命令）断然的；独断的；强制的
  The constable inssued a peremptory order for a 10 p.m.curfew. 警官发布了晚间十点宵禁的强制禁令。

4. preempt（事先抓住、采取pre(=before) + empt(=take)）
  vt.通过优先购买权获得；为得到优先购买权而点有（公地）；先发制人
  preemption n.优先购买（权）；优先获取
  preemptive adj.先取得的；优先购买权的；先发制人的
  The special news bulletin preempted regular programming. 特别新闻快报取代了正常播放的节目。

5. exempt
  v.免除（责任、义务）；豁免 adj.被免除的；被豁免的 *ex(=out)
  exempt from tax 免税的

6. prompt
  adj.迅速的，敏捷的 v.刺激，激励，鼓舞；促使；（为忘记台词的演员）提词，提白 *pro(=before,forth),mpt<empt(=take)
  promptly adv.迅速地，敏捷地；立即地
  prompter n.提词员
  prompt box（舞台上提词人藏身的）提词厢座
  prompt copy 提供词员的剧本

7. promptitude
  n.迅速，敏捷 *pro(=before,forth),mpt<empt(=take)

8. premium
  n.奖赏，奖金（公债、股票等的）溢价 *pre(=before),m<em(=take)

9. redeem
  v.赎回；挽回；解救；履行（承诺、义务等）；弥补，补救；[宗]救赎 *red<re(=again,back),eem<em(=take)
  (the)Redeemer n.救世主，耶稣基督
  redeemable adj.可赎回的；可以挽救的；可偿还的

10. redemption
  n.赎回（买回）；解救；履行 *red<re(=again,back)
  redemption of a promise 履行承诺

11. redemptive
  adj.赎回的；挽回的；补偿的；救赎的 *red<re(=again,bakc)

12. ransom
  n.赎金，赔偿金；（俘虏等的）赎身 *r<re(=again,bakc),ansom<em(=take)

词根词缀：-ase

【来源及含义】Greek: a suffix indicating an enzyme

【相关描述】From Greek diastasis and then (diast)ase, separation, interval [from dia-, through, apart, plus stasis, a standing]; an amylase that converts starch to maltose. Added to the name of a substance it usually indicates an enzyme that hydrolyzes that substance; for example, proteinases hydrolyze proteins and asparaginase hydrolyzes asparagine.

This suffix is also described as the termination denoting an enzyme, suffixed to the name of the substance (substrate) upon which the enzyme acts; e.g., phosphatase, lipase, and proteinase. It may also indicate the reaction catalyzed, e.g., decarboxylase and oxidase. Enzymes named before the convention was established generally have an -in ending; e.g., pepsin, ptyalin, and trypsin.

【同源单词】anhydrase, colipase, creatinase, cyclase, dextrase, glutaminase

词根词缀：clavi-, clav-

【来源及含义】Latin: key; to enclose, to comprise, to include; to fit together, or to work together; pertaining to the collarbone [so named because of its keylike shape]

【同源单词】autoclave, autoclaver, clavelization, claviature, clavichord, clavicle

词根词缀：corac-, coraco-

【来源及含义】Greek: crowlike; used in the specialized sense of "pertaining to, or connected to the coracoid, the bony process that forms part of the scapular arch [and is so named because its shape resembles that of a crow's beak"]

【同源单词】coracoid, epicoracoid, mesocoracoid, precoracoid, sternocoracoid, subcoracoid

词根词缀：galvano-, galvan-

【来源及含义】Named after the Italian physician and physicist who investigated the nature and effects of what he conceived to be electricity in animal tissue; who in 1762 discovered and first described voltaic electricity; electric currents; and primarily, direct electrical current.

【相关词根词缀】 A cross reference of word units that are related, directly and/or indirectly, with "electricity": electro-; hodo-; ion-; piezo-; -tron; volt; biomechatronics, info; mechatronics, info.

【同源单词】electrolysis, Galvani, galvanic, galvanic battery, galvanic corrosion, galvanic couple

词根词缀：jejuno-, jejun-

【来源及含义】Latin: the fasting [intestine], the portion of the small intestine between the duodenum and the ileum [so named because early anatomists typically found this organ to be empty in dissection]; original meaning, "hungry, not partaking of food"

【同源单词】duodenojejunostomy, esophagojejunogastrostomosis, esophagojejunoplasty, esophagojejunostomy, jejunal, jejunectomy

词根词缀：plesio-, plesi-

【来源及含义】Greek: near; resembling that which is named by the combining root

【同源单词】plesiochronous, plesiochronous communications, plesiomorph, plesiomorphic, plesiomorphism, plesiomorphous

词根词缀：-poeia, -poie, -peia, -poiesis, -poesis, -poeic, -poetic, -poietic, -poetical, -poietical

【来源及含义】Greek: making, producing, creating, creative, forming, formation

【相关描述】In medical terminology, the "creation" or "production" of that which is named by the combining root.

【同源单词】agathopoietic, angiopoiesis, ankylopoietic, antipoetic, autopoiesis, biopoiesis

词根词缀：prostato-, prostat-

【来源及含义】Greek: one who stands before, in front of; refers primarily to the prostate gland [so named because it "stands before" the mouth of the bladder]

【同源单词】bacterial prostatitis, cryoprostatectomy, galvanoprostatectomy, prostatalgia, prostatalgia, prostate

词根词缀：scroful-, scrofulo-

【来源及含义】Latin: breeding sow

【相关描述】In the extended sense, it pertains to scrofula, a tubercular swelling, especially of the lymphatic glands [so named, perhaps, because the swelling resembles the shape of a sow or a female hog]).

【同源单词】scrofula, scrofuloderma, scrofulous, scrofulous abscess