obtuse

ob(against)-tuse(to beat, thrust)

adj.愚鈍的 [Lacking quickness of perception]

ex. I've really been very obtuse and stupid.

ex. keenness:obtuse

adj.鈍角的 [ot sharp, pointed, or acute in form; blunt.]

字源：from PIE *(s)tud- "to beat, thrust" cf. L. tudes "hammer,

English Pronunciation - OBTUSE

Acute, Right, Obtuse, and Straight Angles ..(我設定了從18秒開始講起)

obverse

ob(toward)-verse

n.銅幣的正面 [the side of a coin, medal, flag, etc., that bears the principal design (opposed to reverse).  ]

ex. The head of the Queen appears on the obverse of British coins.
英國硬幣的正面有女王的頭像.

n.正面 [the front or principal surface of anything]

n.對立面 [ counterpart.]

adj.對應的 [facing the observer]

adj. [corresponding to something else as a counterpart]

review page 277：

概念上 converse = inverse = reverse [opposite or contrary in direction]

那差別在哪裡呢?我們先從obverse講起好了，

這邊ob的字首指的是toward，

所以obverse的意象就是turn toward to you，「轉向你」是也。

什麼東東會轉向你呢？在古代的邏輯中就是"正面"

比方說人兩兩相對者看，不就是另外一個人的"正面"轉向你嗎。

所以obverse指的就是正面，ex.銅幣的正面，or說正面者。

(再來，它也可以指某opinion, idea的對立面...就是因為這樣使這個複雜了許多，這樣一來，會出現obverse = reverse的錯覺，如果這兩個字都當成opposite arguement的話， 你可以 想成，obverse像是楚漢相爭，以河為界，而reverse像是光與影，有光的背後就是影子。 ...建議把下面的敘述全部看完，再來看這個括弧的內容 )

那跟obverse相反的是什麼，就是reverse了。

這邊的字首re-作back解釋，意像是turn back to you，

所以reverse可以指銅幣的反面

接著我們談inverse，它指的up side down的轉法。

但要注意它用在比較抽象上的。

比方說ratio的 inverse，或者是數學上function 的inverse，ex. tan ^-1 (x)

最後是converse，它比較多用在理論theroem, 命題proposition上的相反。

比方說宇宙最後會收縮的 converse theroem就是「宇宙最後不會收縮 or..」

(同時也可以說是 reverse theroem的唷，其實外國人不太會分別..)

但別忘記唷，converse也有「談話」的字義唷!

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obviate

ob(against)-vi(way)-ate

v.排除,消除 [to anticipate and prevent or eliminate (difficulties, disadvantages, etc.) by effective measures]

ex. to obviate the possibility of a mistake.

ex. The new train obviates the need to drive through the town.

字的概念：to meet and do away with

obvious

ob(against)-vi(way)-ous

adj.明顯的 [easily seen, recognized, or understood]

ex. Her displeasure was obvious.
她的不悅是顯而易見的。

ex. All great truths are obvious truths. But no all obvious truths are great truths

字的概念：plain to see, requently met with

occlude

ob(against)-clud(=close)-e

v.封閉 [To cause to become closed]

ex. to occlude an artery(動脈) ... 這個字常出現在醫學中。

v. [To prevent the passage of]

ex. occlude light; occlude the flow of blood.遮蔽光線;止血

ps. 在氣象學中指「To force (air) upward from the earth's surface, as when a cold front overtakes and undercuts a warm front」

occult

ob(over)-cult(related to hide)

n.神祕學 [the supernatural or supernatural agencies and affairs ]

ps.The occult is the knowledge and study of supernatural or magical forces.

adj.超自然的,神祕的 [Of, relating to, or dealing with supernatural influences, agencies, or phenomena.]

ex. Astrology and alchemy are occult sciences.
占星學和煉丹術為神祕之學。

ex. occult <> patent

v.掩蔽 [To conceal or cause to disappear from view.] /* 我只取大概的意思*/

Secrets of the occult

review page 125 ... 不過我再補充一些東西

cult

n.邪教 (or 異教) [A religion or religious sect generally considered to be extremist or false, with its followers often living in an unconventional manner under the guidance of an authoritarian, charismatic leader.]

ps. A cult is fairly small religious group, especially one which is considered strange.

n.宗教的膜拜 [a particular system of religious worship ]

n.(對人、思想、事物等的)狂熱崇拜,迷信;狂熱

ps. Cult is used to describe things that are very popular or fashionable among a particular group of people

cult最一般的字義是當作 邪教 (or 異教)。

另外比較常見的詞有 cult film，它是指"在有限製作成本之下，以一些極端的表達手法，或以偏激角度、瘋狂思想、怪異觀點拍攝(ex. 暴力、色情)，從中對現實社會現狀寄以不滿的另類電影"

ex. Gozu( 牛頭) ...日本極道的電影

Best Scene From: Gozu (2003)

劇情：黑社會是個層層階級的機制，男主角奉幫會老大之命要解決的對象，竟然是他口中的「大哥」，一路上他欲言又止、欲殺還留，最後大哥卻不見了。於是電影又變成一場尋找大哥的公路之旅，一個比一個怪異的角色，接二連三出現，看似隱諱而超現實。

occupation

ob-cup(=cap; take)-ation

n.職業 [a person's usual or principal work or business, esp. as a means of earning a living; vocation]

n.佔領

ps. The occupation of a country happens when it is entered and controlled by a foreign army.

ex. The Japanese occupation of Taiwan lasted fifty-one years.
日本佔領臺灣達五十一年之久。

occur

ob(toward)-cur(run)

v. [to happen; take place]

ex. When did the accident occur?

occurrence

ob(toward)-cur(run)-ence /*doulbe r*/

n. [Something that takes place.]

ex. An eclipse is an unusual occurrence.

octogenarian

octo(8)-gen( L. ginta ;10 倍 )-arian (=ary+an)

adj.八十歲到八十九歲的 [of the age of 80 years.]

n.八十歲到八十九歲的人

字首 octa- == 8

octo pus n.章魚

octa gon n.

octo ber n.

ps. 凱薩之前的羅馬曆是以三月March為始的，而只有10個月

也就是

之後再加上January, February,

就變成現在的計算方式了

odd

adj.奇特的,古怪的 [strange or unusual]

ex. Something odd began to happen.

ex. odd men out.

(One who, because of strangeness of behavior or belief, stands alone in or out from a group.)

名詞型 oddness

adj.奇數的 [ Designating an integer not divisible by two, such as 1, 3, and 5.]

odds

n.機會,可能性 (使用複數型)

ex. What are the odds of finding a parking space right outside the door?.

ex. at odds of 50 to 1

片語 at odds with = disagree, quarrel

ex. The two companies are at odds with each other.

片語 odds are against (someting or someone) = unlikely to succeed

ex. Odds are against the plan of going picnic tomorrow.

ode

n.頌歌 [A lyric poem of some length, usually of a serious or meditative nature and having an elevated style and formal stanzaic structure.]

ex. ode:poem 頌歌是一種詩

在Greek 中 ode是指 "A choric song of classical Greece, often accompanied by a dance and performed at a public festival or as part of a drama." 但是後來odes gradually lost their musical character.

Ode To The West Wind - Percy Bysshe Shelley 1819

...我對文學的ode不熟，但對理工的ODE(Ordinary differential equation)比較熟一點

odium

n.憎惡 [intense hatred or dislike]

ex.  to incurr the odium of everyone

聯想：工數中，這題ODE 超麻煩的，真是一個odium

odious

adj.可憎的 [ Arousing or meriting strong dislike, aversion, or intense displeasure]

ex. The judge described the crime as odious.

聯想：教授也太沒良心了，居然考這麼難的微分方程式，寫到手都快抽筋了

I think the professor odious!

odometer

odo( f rom Gk. hodos , journey)-meter

n.里程表 [an instrument for measuring distance traveled, as by an automobile.]

題外： How Odometers Work