词根：cred(creed, cre) = to believe, to trust(相信)
来自拉丁语的credere 意为to believe,to trust,它的变形为creed和cre。同义词根有来自拉丁语的fid(fi,fy,feder,feal)以及来自盎格鲁-撒克逊语的tru(tro)等。
unbelievable和incredible 都指“难以置信的”，区别是believe 来源于德语glauben （相信），源自对神的相信进入希腊语演变为gelefan,又变形为belefan,后进入西班牙语最后又演变成了believe,所以，believe是指心理上没有
怀疑地接受，比较主观，而credible和管理、金钱或工作作风等背景有关。
同源词：
1. discredit（不相信dis(=not) + cred(=believe)）
vt. 使不足信；使丢脸
n.信用的丧失；名声的败坏
discreditable adj.有损信用的；丢脸的
discreditably adv. 丢脸地
Press leaks designed to discredit the senator appeared in morining newspapers. 为破坏那个参议员的声誉而由报界泄露的秘密被登在了早报上。
2. credibility（可以信赖 cred(=trust)）
n.可信性
credible adj.可信的
credibly adv.可信地
The credibility of a witness who testifies at trial is key. 出庭作证的人可信度很得要。
3. credulous（信赖的cred(=trust)）
adj.轻信的；易受骗的
credulity n.轻信，易受骗
My mother's so credulous that she believes the car dealer is on her side. 我妈妈是如此轻信别人，以至于相信汽车销售员是站在她这一边的。
4. accredit
v.任命，派出（使节）；（政府等）认可，承认（资格等）；鉴定...为合格 *ac<ad(=to)
accredited school 经鉴定合格的学校
accredited law schools 经鉴定合格的法学院
5. credence
n.相信；凭证
give/attach credence to 相信（传闻或别人的话等）
a letter of credence 证明信
6. credential
n.(pl.)证明书，证件；文凭；（大使递交的）国书
His credentials were so satisfactory that he was given the post of manager. 他的文凭很令人满意，这使他获得了经理的职位。
present one's credentials （大使等）递交国书
credentials committee 资格审查委员会
7. incredible
adj.难以置信的，惊人的，不可思议的 *in(=not)
incredibly adv. 难以置信地
incredible cost 惊人的费用
8. credit
n.（赊账或交易的）信用；名誉，信誉；（银行等的）贷款（金）；贷方（<-->debit 借方）；（某科目的）（所修）学分；荣誉；赞扬
v.信赖；把（金额）记人贷方；给（学生）记学分
credit standing 债务偿付能力，信誉
credit rating 信誉评价，信用等级
letter of credit 信用证（缩写：L/C）
credit inquiry 信用调查
a man of the highest credit 名望最高的人
9. creditable
adj.可信的，名誉好的；值得赞许的
creditably adv.值得称赞地，有好名声地
creditable attempt 值得赞许的尝试
10. creditor
n.贷方，债权人（<-->debtor 借方，债务人）
run away from one's creditors 为躲避债权人而逃跑
11. credo
n.信条；（the Credo）信经
12. incredulous
adj.不相信的，怀疑的 *in (=not)
13. creed
n.宗教信条；教义 *creed<cred(=believe)
the (Apostles')Creed （使徒）信经
14. miscreant
n.恶棍，歹徙 *mis(=bad),cre<cred(=believe)
15. recreant
adj.怯懦的；不忠的，背叛的 n.懦夫；背叛者 *re(=back),cre<cred(=believe)
recreant lover 不忠的恋人
词根词缀：alumino-, alumin-
【来源及含义】Latin: aluminum [U.S.] and aluminium, [British]
【相关描述】This term was coined in 1812 by its discoverer, the British chemist Sir Humphry Davy, as an alteration of the earlier [1808] New Latin alumium, that was also coined by Sir Davy from alumina, a mineral occurring in nature as corundum plus -ium, a suffix meaning, in this case, "metal").
The variant form aluminium, which is preferred in British usage, also appeared in 1812 as a deliberate alteration of aluminum in order to eliminate confusion because of the partial resemblance to other names of certain elements, such as sodium, potassium, and magnesium, all of which were coined earlier by Sir Davy.
【同源单词】aluminate, alumine, aluminium, Aluminoid, aluminosis, aluminothermy
词根词缀：-ard, -art
【来源及含义】a suffix which forms nouns that refer to people who regularly engage in some activity, or who are characterized in a certain way, as indicated by the stem or root of the word; originally, which appeared in Middle English in words from Old French where it expressed an intensive degree or with a pejorative or disparaging application
【同源单词】braggard, coward, drunkard, wizard
词根词缀：glob-, glom-
【来源及含义】Latin: a round body, a ball; round, a sphere; the earth; "sphere" came from Latin globus, "round mass, sphere"; related to gleba, "clod, soil, land". Sense of "planet earth," or a three-dimensional map of it, appeared first in 1553
【相关词根词缀】 Cross references of word families related directly, or indirectly, to: "land, ground, fields, soil, dirt, mud, clay, earth (world)": agra-; agrest-; agri-; agro-; argill-; choro-; chthon-; epeiro-; geo-; lut-; myso-; pedo-; pel-; rhyp-; soil-; sord-; terr-. Related ball, sphere-word units: hemoglobin-; sphero-.
【同源单词】agglomerate, agglomeration, agglomerative, aglobulia, aglobuliosis, calcoglobule
词根词缀：insecto-, insect-, insecti-
【来源及含义】Latin: a bug; literally, "cut into," from insectum, with a notched or divided body; literally, "that which is cut up, segmented" [as the bodies of the first invertebrates to which the term was applied or appeared to be]
【相关词根词缀】 An entomological unit of words about insects.
A cross reference of other word family units that are related directly, or indirectly, with: "insects, bugs, worms; invertebrates":
aphidi-;
api-;
ascari-;
culci-;
Dung Beetle Survival;
Dung Beetles Important;
Eating Worms;
entomo-;
formic-;
Guinea worms;
helmintho-;
Insects: Importance;
isopter-;
larvi-;
lepidopter-;
meliss-;
mosquito;
Mosquito, other Languages;
Mosquitoes, Pt. 1;
Mosquitoes, Pt. 2;
myrmeco-;
scarab;
scoleco-;
sphec-;
taeni-;
termit-;
vermo-.
【同源单词】disinsectization, insect, Insect Biotechnology, Insecta, insectarian, insectarium
词根词缀：loutro-, loutr-
【来源及含义】Greek: bath, bathing
【相关描述】A discussion about the above words appeared in the April 19, 1993, issue of The Christian Science Monitor in an article, "Dictionary Service Answers Questions About Words" (page 14) that described an organization known as "OWLS" [Oxford Word and Language Service]. One writer wrote, "Please can you tell me the word for a person who drinks their [sic] own bath water, as opposed to one who drinks another's bath water?" These words do not exist in any dictionary. Part of the OWLS' reply read: "As the concept is not central to European civilization, I am not surprised that it has failed to find a place in dictionaries. If words for this are needed in the future, then autoloutrophilist and alloloutrophilist are waiting in the wings for their brief flash of celebrity."
【同源单词】autoloutrophilist, louter, loutrophoros