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词根:rad, ras(raz) = to rub, to scrape(刮擦)

  来源于拉丁语 radere 意为to rub, to scrape 刮擦。其变形为raz,ras。

同源词:

1. erase
  v.擦掉 *e<ex(=out)
  erasure n.抹去;擦掉 [-ure抽象名词后缀]

2. eraser
  n.擦除器(如橡皮、黑板擦等)*e<ex(=out)

3. rase/raze
  v.拆毁,夷平
  city razed by an earthquake 被地震夷为平地的城市

4. abrasive [ab(=away) ras/rad(=scrape)] 刮擦以使脱离、消失
  adj. causing abrasion ;harsh,rough 磨擦的,磨损的;使和别人产生摩擦的;烦人的,恼人的;粗糙的;
  n.substance used for rubbing or grinding down surfaces 磨料
  abrasiveness n. 与人关系上的摩擦;
  abrasion n.磨损,磨耗;
  The texture of a cat's tongue is remarkably abrasive.猫的舌头异常粗糙。

5. rascal
  n.恶棍;(开玩笑愚弄人的)捣蛋鬼

6. rascally
  adj.流氓的,卑鄙的
  rascally trick 卑劣的伎俩

7. rash
  n.疹;短时间内爆发的一连串(多指不愉快的事物)adj.急躁的;鲁莽的,轻率的
  heat-rash 痱子
  come out in a rash 身上生满疹子
  rash act 草率的行动
  rash young man 鲁莽的年轻人

8. rasp
  n.粗锉刀;锉磨声
  v.用粗锉刀锉;刺激,使恼怒;发出刮攘声;发出刺耳的声音;用嘶哑的声音大声说
  rasp one's feelings/nerves 刺激某人的感情,神经
  rasp out orders 用嘶哑的声音大声命令
  rasping voice 刺耳的囔音

9. razor
  n.剃刀;刮须刀

10. raze
  v.(从记忆中)消逝;忘却;摧毁

词根:noc (nox, nic, nec) = to harm(伤害)

  来自拉丁语的noc 意为to harm,它的变形有nox,nic,nec等。

  (*拉丁文nocēre (=to harm)——英文字根字典)

同源词:

1. innocuous(不伤害的in(=not) + noc(=harm))
  adj.无害的,(特指蛇等)元毒的;没有恶意的,无意冒犯的
  Uncle Henry is an innocuous enough figure,though he tends to be a bit gruff. 亨利叔叔脾气是有点坏,不过他却是一个毫无恶意的人。

2. obnoxious(给某人伤痛的ob(=to) + nox<noc(=hurt))
  adj.非常讨厌的;令人极为不愉快的;可憎的
  That obnoxious little boy just kicked me in the shin! 那个可恶的小男孩儿刚好踢了我的胫骨!

3. pernicious(完全损害、损伤的 per(=through,thoroughly) + nic<noc(=harm,kill))
  adj.有害的;恶性的
  A pernicious computer virus is invading home computers and erasing their data. 一种有害的计算机病毒正在侵入家用电脑,并删除电脑中的资料。

4. innocent
  adj.无罪的;无害的;单纯的,天真的;愚钝的 n.清白的人;单纯的人;无真无邪的人(尤其指孩子) *in(=not)
  innocence n.无罪,清白;无害;天真,单纯
  innocently adv. 天真地

5. noxious
  adj.有害的;有毒的 *nox<noc(=harm)
  noxious gases 有毒气体

6. internecine
  adj.自相残杀的,两败具伤的 *inter(=between),nec<noc(=harm)

词根:ras, rad = scrape, 表示“刮擦”

erase v. 擦掉(e出+rase→擦出去)

eraser n. 橡皮;黑板擦(erase+er)

abrade v. 磨损(ab去掉+rade→磨擦掉)

abradant n. 砂纸(ab+rad+ant→用来打磨的东西→砂纸)

abrasive a. 有打磨作用的(ab+ras+ive)

raze v. 铲平,摧毁(raze=ras→擦掉→铲平)

razor n. 剃刀(raze+or)

词根:ras, rad 擦, 刮

erase [e-去,除,ras擦,刮] 擦去,抹掉,除去

erasable [见上,-able可…的] 可擦掉的,可抹掉的

eraser [见上,-er表示物] 擦除器(如黑板擦,橡皮等)

erasion [见上,-ion名词后缀] 擦去,刮除,抹掉

erasure [见上,-ure名词后缀] 擦掉,删去,擦掉处

abrade [ab-离开,去,rad擦] 擦掉,磨掉,磨,擦

abradant [见上,-ant名词及形容词后缀] 磨擦着的;磨擦物(如砂纸,金钢砂等)

abrase [ab-离开,去,ras擦] 擦掉,磨掉

abrasion [见上,-ion名词后缀] 擦掉,磨损,擦伤处

abrasive [见上,-ive…的] 有研磨作用的,研磨料(如砂纸等)

raze [raz=ras刮] 刮去,削去,铲掉,铲平

razor [见上,-or表物;’削刮之器”] 剃刀

词根词缀:electro-, electr-, electri-

【来源及含义】Greek > Latin: electric, electricity; from amber, resembling amber, generated from amber which when rubbed vigorously [as by friction], produced the effect of static electricity

【相关描述】Equipment which we use everyday relies on electronics to function including calculators, car controls, cameras, washing machines, medical scanners, mobile telephones, radar systems, computers; as well as many other applications or devices which are listed in this unit.

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

【同源单词】acoustoelectric effect, acoustoelectronics, active electrode, ambulatory electrocardiographic monitoring, amphoteric electrolyte, anelectrotonus

词根词缀:gero-, geri-, ger-, geronto-, geront-

【来源及含义】Greek: old age, old man, old people; elder, elderly; senior citizen

【相关描述】Don't confuse this gero-, ger- with another Latin ger- which means "to carry, to produce; to bear".

【相关词根词缀】 Related "old; old age, elder" units: obsolesc-; presbyo-; sen-; veter-.

【同源单词】agerasia, eugeria, geranosis, geransis, gerascophobia, gerathymia

词根词缀:ligni-, lign-

【来源及含义】Latin: wood

【相关词根词缀】 Related "wood" word units: hylo-; xylo-.

【同源单词】aciculilignosa, gelignite, In silvam ne ligna feras, ligneous, lignescent, lignicole

词根词缀:lucifer, luci-

【来源及含义】Latin: light-bearing, light producing, emitting light

【相关词根词缀】A list of related "light, shining, glow" units: luco-; lumen-, lum-; luna, luni-, lustr-, phengo-, pheno-, phospho-, photo-; scinti-, scintill-.

【同源单词】Lucifer, luciferase, luciferin, luciferous, Luciferphobia, lucific

词根词缀:sylv-, silv-, -sylvia, -silvia

【来源及含义】Latin: woods, forest

【同源单词】In silvam ne ligna feras, Pennsylvania, savage, savagely, savageness, savagery

词根词缀:terato-, terata-, terat-, tera-

【来源及含义】Greek > Latin: marvel, omen, monster; malformation

【同源单词】tera-, teramorphous, teras, teratic, teratism, teratocarcinoma