词根：tri, trit = to rub（擦）

  词根tri来源于拉丁语 terere 擦,trit为他的变体，意为to rub 。同义词根为fric。注意tri有同形异义词根：-tri- 三 / 三倍 / 三重，来源于拉丁语或希腊语 tri，如：tribe 部落 / 部族、tribal 部落的 / 种族的；有异形同义词根：-terg- / -ters- 擦 / 清洗，来源于拉丁语 tergere，如：deterge 使清洁 / 去污、absterge 去垢/擦去。

同源词：

1. attrition（用力擦at<ad(=to,intensive) + trit(=rub)）
  n.消耗，磨损；（由于死亡、退休等造成的）人员自然缩减
  attrit v.消耗；削弱
  attrited adj.磨损的
  The company is downsizing its staff by attrition rather than layoffs. 公司减员是通过人员自然缩减实现的，而非通过裁员。

2. contrite（用力擦的 con<com(=intensive,together) + trit(=rub)）
  adj.悔罪的，深感懊悔的
  contrition n.懊悔，忏悔
  My nephew seemed genuinely contrite about having taken money from my purse. 我侄子看起来是在真心懊悔从我钱包里拿钱的事。

3. detriment
  n.损害，损伤 *de(=away,intensive)
  to the detriment of his health 对他的健康有害

4. detrimental
  adj.有害的 *de(=away,intensive)
  detrimental to our interests 有损我们利益的

5. detritus
  n.[地]岩屑（岩石因风化作用掉下来的石粒或碎屑），碎石 *de(=away,intensive)

6. trite
  adj.（话、想法、意见等）阵腐的；无新意的

词根：man (mn, main) = to flow, to stay

  来自拉丁语的man 意为to flow ,to stay,它的变形为mn,main。当意为to flow 时，同义词根有来自拉丁语的flu,lix和来自希腊语的rrh。

同源词：

1. emanate（向外流e<ex(=out) + man(=flow,stay)）
  vi.from + sth散发（气味、光、声音、蒸汽、热等）；发源
  emanation n.散发（物）
  The pain seems to emanate from the general location of my liver.疼痛好像来自肝那个部位。

2. remnant（再一次、继续逗留re(=again) +mn<man(=stay)）
  n.乘余，残余；（削价出售的）零料，零碎布头；(pl.)遗迹
  I bought this big bag of fabric remnants for just fifty cents.我只用50美分就买下了这一大包的零碎布头。

3. immanent
  adj.（性质）内在的；固有的；（上帝）无所不在的 *im<in(=in)
  immanence n.内在性；（上帝的）无所不在

4. immanuel
  n.以马内利（基督教《圣经》中先知Isaiah 及圣教徒Matthew等对耶稣基督的别称，意为：上帝与我们同在）*im<in(=in)

5. permanent
  adj.永久的，永恒的；固定性的；常在的 *per(=throughout)
  permanently adv.永久地
  permanent peace / tooth /address 永久的和平/恒齿，恒牙/固定地址
  permanent wave 烫发

6. permanence
  n.永久，永恒（性）；持久（性） *per(=throughout)
  permanency n.永恒的事物
  Is your new job a permanency or merely temporary ?你的新工作是固定的还是临时的？

7. manor
  n.领地；庄园（封建制度下领主所管辖的土地，包括领土直飞属土地和租种的土地
  manorial adj.领地的；庄园的
  manor house 庄园主宅地

8. manse
  n.（苏格兰的）牧师住宅

9. mansion
  n.大厦；（雄伟的）宅第；[用于专有名词中]公寓大楼
  victor Mansions 维多利亚公寓大楼

10. remainder
  n.剩余；残余者（物）；滞销图书 *re(=again) ,main<man(=stay)

11. remain
  v.留下，遗留；逗留；保持  *re(=again) ,main<man(=stay)

12. remains
  n.残留物；遗迹；遗体，遗骸 *re(=again) ,main<man(=stay)
  the remains of a meal 剩下的饭菜
  the remains of ancient Rome 古罗马遗迹
  his mortal remains 他的遗骸

词根词缀：cement-

【来源及含义】Latin: caementa, "stone chips" from caedere, "to cut down, chop, beat, hew, fell, slay"

【同源单词】cement, cementation, cementatory, cementite, cementum

词根词缀：mandibulo-, mandibul-, mandibuli-

【来源及含义】Latin: jaw, lower jaw; from mandere, "to chew"

【同源单词】mandible, mandibula, mandibular, mandibulary, mandibulate, mandibulectomy

词根词缀：mastic-, masti-

【来源及含义】Latin: to chew; Greek: to gnash, grind, or rub the upper and lower teeth together

【同源单词】mastic, masticable, masticate, mastication, masticator, masticatory

词根词缀：nepot-, nepo-

【来源及含义】Latin: nephew; grandson, grandchild; descendant [family member]; nepotism, et al.

【相关描述】Said to be used in the Middle Ages by Catholic popes to show favoritism to their illegitimate children for positions of power. The use of  "nephew" was a euphemism for their "out-of-wedlock" offspring.

【同源单词】nepotal, nepotic, nepotious, nepotism, nepotist

词根词缀：rumin-, rumina-

【来源及含义】Latin: to chew over again, to chew the cud; to muse or to meditate; that is, to think about something in a deep and serious or dreamy and abstracted way or to think about something carefully, calmly, seriously, and for a long time

【同源单词】cud, obsessive rumination, rumen, rumenitis, ruminant, Ruminantia