irradicable
in-radi(root)-cable [ex. eradicate]
adj.無法根除的 [Impossible to uproot or destroy; ineradicable]
ex. an irradicable disease
一種無法根除的疾病
irradicable:remove
irreconcilable
in-re-concil-able
adj.不可調和的, 和解的 [ incapable of being made to acquiesce or compromise]
ex. The separated couple was irreconcilable.
那對分居的夫妻不可能和解。
n.不能和解的反對者
review p.101 or p.111
----------------------------------------
conciliate
concil(=council n.議事 n.協調會 )-i-ate
v.安撫,撫慰
v.調解
council n.協調會 [an assembly of persons called together for discussion]
concil-iate v.安撫、使和好 [to overcome the distrust or animosity of; appease]
consul n.駐外領事
consult v.與...商量 [to seek advice or information from]
condole v.哀悼;同情 [to express sympathy with a person who is suffering sorrow]
----------------------------------------
irredeemable
in-redeem-able
adj.不能贖回的 [not redeemable; incapable of being bought back or paid off.]
adj.不能挽救的, 不可救藥的 [Impossible to remedy]
ex. irredeemable losses.
ex. irredeemable sinners.
不能挽救的罪人
ps. 鈔票不能換成硬幣的，也是用這個字 irredeemable
ps. 有些gift card裡面的錢也是irredeemable的...
redeem
v.買回;贖回 [to recover (something pledged or mortgaged) by payment or other satisfaction]
ex. to redeem a pawned(典當的) watch
v.償還,還清 [to buy or pay off; clear by payment]
ex.to redeem a mortgage.
字源：red=re"back, eem from L.emere"to buy"
irremediable
in-remedy-iable
adj.不能治療的, 不能挽回的 [Impossible to remedy, correct, or repair; incurable or irreparable]
ex. an irremediable error
不能挽救的過失
ps.
remedy
n.治療
n.補救
v.治療, 補救
字源： re + med(ērī) to heal, assuage
ex. medicine [med-ic-ine] n.藥
irreducible
in-reduce-ible
adj.不能縮減的;不能減小的 [not reducible; incapable of being reduced or of being diminished or simplified further]
ex. to an irreducible minimum
ps.1 irreducible 在數學上指不能再約分的
ps.2 reduce的字構是re(back)-duc(lead)-e
ps.3 有一個詞Irreducible complexity是有關生物方面的，指的說生物太過複雜，不可能由某個簡單的祖先演化而得的，see youtube影片
irrepressible
in-repress-ible
adj.壓抑不住的 [Difficult or impossible to control or restrain]
ex. an irrepressible laughter
ps.
repress [re-press] v.鎮壓
irrevocable
in-revoke-able
adj.不能變更的, 不能撤回的 [not to be revoked or recalled; unable to be repealed or annulled; unalterable]
ex. The decision was irrevocable.
作出的決定已不能更改。
ex. Once you say that to your mother, the damage is irrevocable. It will permanently hurt her feeling. (2014 March 補充)
revoke [re-vok(=voc; call)-e] v.撤回,取消
ps. 通常看到這個字，是在irrevocable letter of credit，或者是寫成irrevocable L/C，L/C是國際結算的一種方式，在國際貿易中一般採用irrevocable L/C。
irrigate
v.灌溉 [to supply (land) with water by artificial means, as by diverting streams, flooding, or spraying.]
ex. Some plains rivers regularly fertillize and irrigate surrounding areas with their floods.
有些平原河流不斷地以其洪水培肥和灌溉著周圍的地區。
v.【醫】沖洗(傷口等) [Medicine/Medical. to supply or wash (an orifice, wound, etc.) with a spray or a flow of some liquid.]
聯想： irri + gate 後面結尾有個gate，代表是水門，是灌溉的水門
字源：Latin irrigāre, in + rigāre to water
irritate
v.激怒 [to excite to impatience or anger]
v【病理學】使發炎, 使疼痛 [Pathology. to bring (a body part) to an abnormally excited or sensitive condition.]
ps. 像是有些浴廁的清潔劑會讓眼睛有irritation.
字源：L irrītātus, ptp. of irrītāre "to arouse to anger, excite"
irritable
irrita(=L. irritare)-able
adj.易怒的,易煩躁不安的 [easily irritated or annoyed; readily excited to impatience or anger.]
ex. The news made John irritable.
這消息使約翰煩躁不安。
irritation
n.激怒 [ the act of irritating or the state of being irritated.]
n.刺激物;惱人事 [something that irritates.]
antidote:poisoning＝balm:irritation
解毒劑消除中毒＝安慰物消除疼痛
isolate
v.使孤立 [to set or place apart; detach or separate so as to be alone.]
ex. Several villages have been isolated by lack of buses.
由於缺少公車,有幾個村子顯得很偏僻。
v.【電】使絕緣 [Electricity. to insulate.]
n.孤立的人、事物
review p.270
----------------------------------------
字根 insula==島
insul-ar adj.島嶼的、與世隔離的
insul-ate v.使絕緣 [ 防止熱，電或聲音的進出 ]
c.f
isolate v.孤立 [這個isol與島有關，注意字型--沒有n]
in-sol-ate v.使暴露在陽光下 [字根sol=太陽，ex. solar太陽的]
----------------------------------------
isotope
iso(equal)-tope(place)
n.同位素 -- 有相同數量的electron, proton, 但有不同數量的neutron.
字源：iso-+ G.k topos, place
這裡的意思是指在元素週期表(periodic table)中有同樣的位置
ex. isotope of Carbon 12C 13C ...在自然界都能stable