词根：preci(prais, pric, priz) = price（价格, 价值）
来源于拉丁语 pretium 价值,prais,pric,priz为preci的变形。
同源词：
1. appreciable [可以给某物定价的ap<ad(=to)+preci(=price)]
adj. 可感知的；可观的；可估计的
appreciate v.感谢；正确评价；欣赏；（充分）意识到
appreciation n. 感谢；评价；欣赏；重视
appreciative adj.欣赏的；感激的
appreciably adv.相当地；明显地；可察觉地
My uncle earned an appreciable amount of money in the stock market. 我叔叔在股市赚了一大笔钱。
2. depreciation [价格向下、降低de(=down)+preci（=price）]
n. 降价，贬值；轻视；折旧
depreciate v. 降价；轻视，藐视
depreciatory adj.降价的；轻视的
Capital equipment taxes are calculated after factoring in depreciation．资本设备税的计算要先考虑折旧因素。
3. precious
adj.贵重的，珍贵的；<口> 十足的；可爱的 ad.非常，很
precious metal 贵金属
precious stone 宝石
precious fool 十足的傻瓜
precious cold 非常冷
4. appraise
v.评价；估价 *ap<ad(=to), prais<preci(=price)
5. appraisal
n.评价；估价 *ap<ad(=to), prais<preci(=price)
interim appraisal 临时/中期评估
6. praise
v./n. 称赞，赞美 *prais<preci(=price)
praiseworthy adj.值得称赞的，可嘉的
win high praise 赢得高度赞扬
in praise of 赞美…
7. price
v.给…定价；问…的价格几价格；代价；赏金
pricy adj.昂贵的
price cartel 价格协定
price index 物价指教
price tag （贴在商品上的）价格标签
market price 市价
special price 特价
fixed /set price 固定价格
asking price 要价
at cost price 按成本价
put a price on one's head 悬赏捉拿或处死某人
8. priceless
adj.贵重的，稀世珍重的；<口>极荒唐的；极有趣的 *pric<preci(=price)
priceless paintings 非常贵重的画
9. prize
n.奖赏；奖品；赏金；捕获物，战利品；（竞争等的）目标 v.评价；重视
adj.该得奖的；了不起的；得奖的；作为奖品的 *priz<preci(=price)
prizewinning adj.获奖的，得奖的
prize for good conduct 善行奖
consolation prizes 安慰奖
prize scholarship 成绩优良奖学金
prize winner 获奖者
prize medal 奖章
词根：somn = to sleep（睡眠）
词根somn 来自拉丁语的somn意为 to sleep。同义词根有来自拉丁语的dorm和来自希腊语的com,hypn。
（*拉丁文somnus (=sleep)——英文字根字典）
同源词：
1. somnolent （睡觉的 somn (= sleep)）
adj.困倦的，昏昏欲睡的；催眠的
somnolence n.困倦，昏昏欲睡
The children grew somnolent,staring into the campfire's dying flames.孩子们看着将要熄灭的营火，渐渐地困倦起来。
2. somnambulism n.梦游病 *ambul (=walk)
somnambulist n.梦游病患者
somnambulate v.梦游（睡眠时走动）
3. somniloquy n.说梦话（的习惯） *loqu (= say)
somniloquist n.说梦话的人
4. somniferous ajd.催眠的；想睡的（产生睡眠欲望） 《-ferous = causing》
5. insomnia n.失眠；失眠症 *in (=not)
insomniac n.失眠症患者
ill after weeks of insomnia 因为好几周的失眠而生病的
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：-cola, -colas; -cole; -colent; -colid; -coline; -colous
【来源及含义】Latin: to inhabit; to live in, to live on, to live among; to dwell; living among, dwelling in; occurring on, occurring in
【相关描述】Suffixes that refer to the location or an area of growth. Used primarily in botanical and biological terminology to indicate a plant or an organism that is characterized by a habitat or place of existence as indicated by the combining root.
The suffix -cole is derived from Latin colere, "to inhabit, to dwell, to live".
Don't confuse this -cole, -cola , "inhabit, live in, dwelling in" unit with the following cole-, coleo- (sheath, scabbard, vagina); coll-, col- (neck); collo-, coll- (glue); colo-, col- (colon, large intestine); and colon-, coln- (farm, settlement) units.
【相关词根词缀】 Related life, live-word units: anima-; bio-; vita-; viva-.
【同源单词】acarocola, acarocole, acarocoline, acarocolous, acrodendrocola, acrodendrocole
词根词缀：epano-, epan-
【来源及含义】Greek: again; occurring in some rhetorical terms
【同源单词】epanadiplosis, epanalepsis, epanastrophe, epanodos, epanorthosis, epanthous
词根词缀：ex-, e-, ef-
【来源及含义】Latin: a prefix occurring in words of Latin origin used in the senses: out, out of, from; upward; completely, entirely; to remove from, deprive of; without; former [said of previous holders of office or dignity]
【相关描述】Before f, ex- becomes ef-; before all voiced consonants (as b, d, g, etc.) ex- becomes e-.
【同源单词】e pluribus unum, educate, educe, efface, effacement, effete
词根词缀：firm-
【来源及含义】Latin: strong, firm; steadfast or unwavering in purpose, loyalty, or resolve
【同源单词】affirm, affirmable, affirmation, affirmative, affirmative action, affirmatively
词根词缀：homeo-, homoeo-, homio-, homoio-
【来源及含义】Greek: same, like, resembling, sharing in common, similar, equal
【相关词根词缀】 Inter-related cross references, directly or indirectly, involving word units dealing with "equal, identical, same, similar": auto-; emul-; equ-, equi-; homo-; iso-; pari-; peer; rhomb-; syn-; tauto-.
【同源单词】homeocephalic, homeogeneous, homeogenesis, homeokinesis, homeometric, homeomorphic
词根词缀：-ian
【来源及含义】Latin: suffix form of -an from -ianus, a modifier of the main word to which it is attached: belonging to, coming from, being involved in, or being like something
【相关描述】Appearing in such words as comedian, egalitarian, Bostonian, Italian, Smithsonian, mathematician, Alabamian, Californian, Arizonian, and Canadian. It is attached to the root of common or proper nouns with the meanings "of, pertaining to, from", or "like" the proper name appearing in the stem.
【同源单词】abecedarian, academician, acanthopterygian, acararian, acoustician, aeolian
词根词缀：intra-
【来源及含义】Latin: within, inside, on the inside
【相关描述】Borrowed from late Latin intra-; closely related to inter-, "between". The use of intra- is largely a product of modern times, occurring in words of common and technical vocabulary, where once it was generally a term used in science and the academic world.
While some words are borrowings from Medieval and even Late Latin, few if any come from Classical Latin.
【相关词根词缀】Cross references of word families related directly, or indirectly, to: "internal organs, entrails, inside": ent-; enter-; fistul-; incret-; inter-; splanchn-; viscer-.
【同源单词】Ab intra, abdominohysterotomy, Discere si cupias intra, endopelvic, international, intra muros