词根：flu, flux = to flow 流动
词根flu来源于拉丁动词fluere,意思是to flow （流动），flu有个异形根flux,它来自动名词fluxum的词干部分。同义词根还有来源于希腊语的rrh和来源于拉丁语的lix,man等。
同源词：
1. affluence [继续、不断地流出af<ad(=to, intersive) +flu(=flow)]
n. 富饶，富有；丰富
affluent adj. 富饶的，富有的；丰富的
ex) Affluence is a way Of life for most American physicians. 大多数美国医生都过着富有的生活。
2. fluctuate [流动flu(=flow)]
vi. （物价、温度等）上下变动，波动；动摇
fluctuation n. 上下变动，波动；动摇
ex) The exchange rate fluctuates wildly,sometimes as much as 10% in one day. 汇率变动幅度很大，有时候甚至一天之内变动达10%。
3. fluent [话从嘴中说出的flu(=flow)]
adj. 流畅的，流利的
fluency n. 流畅，流利
ffuently adv. 流畅地，流利地
He's fluent in both Chinese and Japanese. 他的汉语和日语讲得都很流利。
4. confluence
n.（江河的）交汇（处）*con<com(=together)
confluent adj. 汇合的
5. effluent
n.（江河、湖泊、阴沟等流出的）水流；流出物 *ef<ex(=out)
6. efflux
n. （液体或气体的）流出；流出物 *ef<ex(=out)
7. flue
n. 暖气管；烟道
clean the flues of soot 把满是烟友的烟道打扫干净
8. fluid
n. 流体（液体与气体的总称）；液
adj. （像气体、液体一样）流动的；（思想等）不稳定的
fluidity n.流动性；易变性
fluid opinions，plans 易变的意见/计划
9. flume
n. 阵风，阵雨，阵雪；慌张 v. 使（某人）慌张
in a flurry of alarm 一阵慌张
Don't get flurried. 别慌。
10. flush
v. （脸）发红；使得意；用水冲洗；（水）奔流
n. 红晕；激动，兴奋，茂盛；（草木等的）发芽
ex) The girl flushed when the boy spoke to her. 男孩子跟女破搭话时，女孩子的脸红了。
flush the pan 冲洗平底锅
in the first flush of victory 沉浸在胜利带来的最初的喜悦中
11. fluvial
adj. 河流的，生长在河流中的
12. flux
n. （水的）流动，流出；不断变动；焊剂；涨潮
in a state of flux 不断变动的
the flux and reflux 涨潮落潮；（喻）不断消长
13. circumfluent
adj. 环流的；周围的（流过四周）circum-(=around)
circumfluence n.环流；周流
14. influent
adj.流入的 n.支流（流入其中）in-(=into)
influence n.影响力；感化力；权势 v.影响；改变
influential adj. 有影响力的
15. refluent
adj.逆流的；倒流的（逆流的）re- (=back)
refluence n.逆流；退潮
16. superfluous
adj.多余的；不必要的（流过） super-(=over)
superfluity n.多余
17. inflow
n.流入；输入 in-(=into)
18. overflow
v.流出；溢出；泛滥；充溢
n. 泛滥；充溢 over-(=excessively)
19. reflow
v. 流回；落潮 re-(=back)
20. influx
n. 流入；注入；汇流处；灌输（注入其中）in-(=into)
21. reflux
n.逆流；退潮 re-(=back)
词根词缀：fa-, fam-, fan-, fant-, fat-, -fess; fab-, fabul-
【来源及含义】Latin: fari-, "to say, to talk"; telling, speak, say, spoken about; acknowledge
【相关词根词缀】Cross references of word families related directly, or indirectly, to: "talk, speak, speech; words, language; tongue, etc.": cit-; clam-; dic-; -farious; glosso-; glotto-; lalo-; linguo-; locu-; logo-; loqu-; mythico-; -ology; ora-; -phasia; -phemia; phon-; phras-; Quotes: Language,Part 1; Quotes: Language, Part 2; Quotes: Language, Part 3; serm-; tongue; voc-. Cross references of word families that are related directly, or indirectly, to: "divination, diviner; seer, soothsayer, prophecy, prophesy, prophet": augur-; auspic-; Fates in action; futur-; -mancy; omen; -phemia; sorc-, sorcery; vati-.
【同源单词】affability, affable, affableness, affably, confabulate, confabulation
词根词缀：radio-, radi-, rad-
【来源及含义】Latin: ray, radiating [the Latin word for the spokes of a wheel is radius]; spoke, staff, rod
【同源单词】involuntary euthanasia, irradiance, irradiant, irradiate, radial, radian
词根词缀：rhetor-
【来源及含义】Greek: rhetorike tekhne, "the technique or art of public speaking" > Latin: orator; that which is spoken
【同源单词】rhetor, rhetoric, rhetorical, rhetorical question, rhetorically, rhetoricaster
词根词缀：tacit-, taci-, tace-
【来源及含义】Latin: silent, silence; unspoken; quiet
【同源单词】Qui tacet consentit, reticence, reticent, tace, tacenda, Tacet