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
词根词缀：bruxo-, brux-
【来源及含义】Greek: grinding or gnashing the teeth; rubbing the teeth together
【相关词根词缀】 Related "tooth, teeth" word units: dento-; odonto-. Cross references of word families that are related directly, or indirectly, to: "rub, rubbing; wear away; wipe": frica-, frict-; terg-; tribo-; -tripsy; trit-.
【同源单词】bruxating, bruxer, bruxing appliance or, bruxism, bruxomania, bruxomaniac
词根词缀：frica-, frict-, -frice
【来源及含义】Latin: a rubbing, to rub
【相关词根词缀】 Cross references of word families that are related directly, or indirectly, to: "rub, rubbing; wear away; wipe": bruxo, brux-; terg-; tribo-; -tripsy; trit-.
【同源单词】affriction, antifriction, dentifrice, fricative, friction, friction layer
词根词缀：terg-
【来源及含义】Latin: to rub, polish, wipe
【相关词根词缀】 Cross references of word families that are related directly, or indirectly, to: "rub, rubbing; wear away; wipe": bruxo, brux-; frica-, frict-; tribo-; -tripsy; trit-.
【同源单词】absterge, deterge, detergence, detergency, detergent, detergents
词根词缀：tribo-, trib-
【来源及含义】Greek: friction, rub, rubbing, grind, wear away; spend, waste time; be busy
【相关词根词缀】 Cross references of word families that are related directly, or indirectly, to: "rub, rubbing; wear away; wipe": bruxo, brux-; frica-, frict-; terg-; -tripsy; trit-.
【同源单词】diatribe, electrostatic series, hydrotribophile, hydrotribophilous, hydrotribophily, hydrotribophyte
词根词缀：-tripsy, -tripsis, -tripic
【来源及含义】Greek: to crush; to massage, to rub, rubbing, friction, to grind
【相关词根词缀】 Cross references of word families that are related directly, or indirectly, to: "rub, rubbing; wear away; wipe": bruxo, brux-; frica-, frict-; terg-; tribo-; trit-.
【同源单词】anatripsis, angiotripsy, cephalotripsy, cholecystolithotripsy, choledocholithotripsy, cleidotripsy
词根词缀：trit-
【来源及含义】Latin: to rub; to thresh, to grind; to wear away; from tritus, past participle of terere, "to rub"
【相关描述】Don't confuse this trit- with another trit- which means "third".
【相关词根词缀】 Cross references of word families that are related directly, or indirectly, to: "rub, rubbing; wear away; wipe": bruxo, brux-; frica-, frict-; terg-; tribo-; -tripsy.
【同源单词】antiattrition, attrite, attrition, biodetritus, contrite, contritely