词根：cis(cas, chis), cide = to cut（切）

  cis和cid是一对同源异形根，来自拉丁动词caedere, 意为 to cut（切）。cid是不定式词干，cis是动名词词干。其变形为cas 和chis。同义词根有来自拉丁语的torn(tem) ,scind/scis,sect,sever,tail,tons,trench,cop/coup等。

同源词：

1. concise（好好地切的 con<com(=intensive) + cis(=cut)）
  adj.简洁的；简明的
  conciseness n.简洁
  concisely adv.简洁地
  Class,please write concise answers to the essay questions. 同学们，请简要写出这篇文章问题的答案。

2. excise（切掉 ex(=out) + cis(=cut)）
  vt. 切除；删除
  n.国内消费税，货物税
  excision n.切除；删除
  He insisted that the violent scenes be excised from the film. 他坚持应删除电影中的暴力场面。

3. incisive（砍向里面或内部的 in(=in,into) + cis(=cut) + -ive 形容词后缀）
  adj.锐利的，尖锐的；激烈的；敏感的；果断的
  incision n.切割，切开；切口
  incisor n.门牙
  incise v.切割；雕刻，铭刻 《in- = in》
  She's an incisive editor and cuts right to the bone. 她是一个果断的编辑，修改删节大刀阔斧。

4. circumcision
  n.（尤其指犹太等为男婴施行的）割礼；割包皮 *circum(=around)
  circumcise v. 为...割包皮；为...行割礼
  He was never circumcised,and i feel his uncircumcised penis is a turn off to women. 他没有做过包皮切除手术，我想女人们因此而离开他。

5. decisive
  adj.决定性的，决定的；坚决的；确定的 *de(=down)
  decisively adv.决定性地
  decisive battle 决战
  decisive evidence 确证
  decisive ballots 决选投票

6. precis
  n. <法>大意，概略，摘录 *pre(=before,intensive)
  vt. <法>为…写摘要，概括…的大意

7. precise
  adj.精确的；确切的；细致的，严格；刻板的 *pre(=before,intensive)
  precise measurements 精确的测量
  a very precise man 非常刻板的人

8. precisely
  adv.精确地；一丝苟地；（用于肯定回答）对，确实如此

9. chisel
  n.凿子，凿刀 v.用凿子凿、刻、雕 *chis<cis(=cut)

10. castration
  n.阉割，删改 *cas<cis(=cut)
  castrate v.阉割；删改

11. fratricide
  n.杀害兄弟姐妹者《fratri = 拉丁文frater = trother》 cf.fraternity （手足之情）

12. insecticide
  n.杀虫剂《insect = 昆虫》

13. matricide
  n.杀母者《matr = 拉丁文 mater =mother》 cf.maternity （母性）

14. patricide
  n.杀父者 《patri = 拉丁文 pater =father》 cf.paternity （父性）

15. suicide
  v.,n. 自杀（者）（将自己切割）《拉丁文su- = self》

16. bactericide（bacteri = bacteria 细菌；-cide n. = killer 杀...剂）
  n. 杀菌剂
  bactericidal adj.杀菌的

词根词缀：-cide, -cides, -cidal

【来源及含义】Latin: a suffix; kill, killer; murder, to cause death, slayer; cutter; “to cut down”

【相关描述】Don’t confuse this element with the another -cide that means “to cut”; although -cide, “death”, is related to -cise, -cide, “to cut down”.

【相关词根词缀】 Related "death, dead; kill" units: lethal-; mort-; neci-; necro-; phono-; thanato-.

【同源单词】aborticide, acaricide, adulticide, algaecide, algicide, algiocide

词根词缀：-cise, -cis, -cide

【来源及含义】Latin: to cut, cut

【相关描述】From this combining form, we also get -cide, "kill", but don't confuse the two elements because they have different meanings and applications.

【相关词根词缀】Related cutting-word units: cast-; castrat-; -ectomy; mutil-; put-; sec-, seg-; temno-; -tomy; trunc-.

【同源单词】cement, chisel, circumcise, concise, concisely, conciseness