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—ANTONYM outward

i•o •dine / aiadain / noun [ noncount ] ( symbol I )

( chemistry ) a dark substance that is found in the water in oceans. A liquid containing iodine is sometimes used to clean cuts on your skin.

IOU / |ai ou yu / noun [ count ] ( informal )

a piece of paper that shows you promise to pay someone the money you owe them IOU is a way of writing "I owe you."

IPA / |ai pi ' ei / abbreviation

( english language arts ) a system of symbols to show how words sound IPA is short for "International Phonetic Alphabet."

IQ / |ai ' kyu / noun [ cou nt ]

a way of measuring how intelligent someone is

She has an IQ of 128.

IQ is short for "intelligence quotient."

Prefix

ir-

( used with words beginning with "r" ) not; the opposite of ir regular ir relevant ir responsible ir resistible

i . гоп 1 ©7 aiorn / noun

[ noncount ] ( symbol Fe ) ( chemistry ) a strong hard metal

The gates are made of iron. an iron bar

[ count ] a piece of electrical equipment that gets hot and that you use for making clothes smooth

Don't forget to unplug the iron.

i • ron 2 / ' aiarn / verb

( i - rons , i - ron ing , i roned )

to make clothes smooth using an iron 1 ( 2 ) Can you iron this shirt for me? ► i • ron • ing / aiarnig / noun [noncount] clothes that need to be

ironed

I usually do the ironing on Sunday night.

i • ron • ic / ai ranik / adjective

meaning the opposite of what you say

When I said it was a beautiful day, I was being ironic.

i • ron • ing board / ' aiarnig bord / [count ]

a special long table where you iron clothes — Look at the picture at iron .

i • ro • ny / ' airani / noun [ count, noncount ] ( plural i . ro . nies )

a strange or unusual part of a situation that is different from what you expect

The irony is that when she finally got the job, she discovered she didn't like it.

ir • ra • tion • al aw / i ' гж/эп1 /

not based on facts; not sensible an irrational fear of worms

—ANTONYM rational

ir • ra • tion • al • ly AWL| / i'rrejbnali / adverb to behave irrationally

ir • reg • u • lar / i ' regyalar /

happening at different times Their visits were irregular.

( english language arts ) A word that is irregular

does not have the usual verb forms or plural "Catch" is an irregular verb.

—ANTONYM regular

ir • rel • e • vant aw / i ' relavant /

not connected with something and not important Your point is completely irrelevant to the discussion.

—ANTONYM relevant

ir • re • sis • ti • ble / |iri ' zistabl /

so powerful or attractive that you cannot stop yourself from

wanting or doing it

Those chocolates look irresistible.

ir •re • spon • si • ble / |iri ' spansabi /

adjective

not thinking about the effect your actions will have; not sensible

It was irresponsible of him to leave his little sister alone in the house.

—ANTONYM responsible

ir • ri • gate / ' irageit / verb ( ir . ri . gates , ir . ri gat . ing , ir . ri . gat ed )

to supply water to land for growing food, using pipes or other equipment

ir • ri • ga • tion / |ira ' geijn / noun [ noncount ]

ir • ri • ta • ble / ' iratabl /

becoming angry easily

He's very irritable in the morning.

ir • ri • tate / ' irateit / verb ( ir . ri . tates , ir . ri . tat . ing , ir . ri . tat . ed )

to make someone angry

He irritates me when he asks so many questions.

( health ) to make a part of your body hurt a little Cigarette smoke irritates my eyes.

ir • ri • ta • tion / |ira'teijn / noun [ count, noncount ] This plant can cause irritation to your skin.