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ir·ri·tate verb -tat·ed; -tat·ing 1 : to excite to anger : EXASPERATE

2 : to make sore or inflamed

— ir·ri·tat·ing·ly adverb

Synonyms

[1] aggravate, annoy, bother, bug, chafe, exasperate, gall, get, grate, irk, nettle, peeve, persecute, pique, put out, rasp, rile, vex; also hassle, heckle; nag; inflame, provoke, rouse; bait, harass, harry, pester; anger, enrage, incense, infuriate, madden; agitate, disturb, fret, perturb, upset; affront, insult, offend, outrage

[2] abrade, chafe, gall—more at CHAFE

ir·ri·tant noun : something that irritates or excites

— irritant adjective

Synonyms

aggravation, annoyance, bother, exasperation, frustration, hassle, headache, inconvenience, nuisance, peeve, pest, problem, thorn—more at ANNOYANCE

irritating adjective : causing displeasure or annoyance

Synonyms

aggravating, annoying, bothersome, frustrating, galling, irksome, pesty, vexatious—more at ANNOYING

ir·ri·ta·tion noun : the act of irritating : the state of being irritated; also : something that irritates

ir·rupt verb 1 : to rush in forcibly or violently

2 : to increase suddenly in numbers

ir·rup·tion noun : an act or instance of irrupting; especially : a sudden violent or forcible entry

Synonyms

descent, foray, incursion, invasion, raid—more at RAID

IRS abbreviation Internal Revenue Service

is present 3d singular of BE

Isa or Is abbreviation Isaiah

Isa·iah noun 1 : a major Hebrew prophet in Judah about 740 to 701B.C.

2 : a book of Jewish and Christian Scripture

Isa·ias noun : ISAIAH

ISBN abbreviation International Standard Book Number

is·che·mia noun : deficient supply of blood to a body part (as the brain)

— is·che·mic adjective

-ish adjective suffix 1 : of, relating to, or being

2 : characteristic of

3 : inclined or liable to

4 : having a touch or trace of : somewhat

5 : having the approximate age of

isin·glass noun 1 : a gelatin obtained from various fish

2 : mica esp. in thin sheets

isl abbreviation island

Is·lam noun [ORIGIN: Ar islām submission (to the will of God)]

: the religious faith of Muslims including belief in Allah as the sole deity and in Muhammad as his prophet; also : the civilization built on this faith

— Is·lam·ic adjective

is·land noun [ORIGIN: ME iland, fr. OE īgland, fr. īg island + land land]

1 : a body of land smaller than a continent surrounded by water

2 : something resembling an island in its isolation

Synonyms

cay, isle, key

is·land·er noun : a native or inhabitant of an island

isle noun : ISLAND; especially : a small island

is·let noun : a small island

ism noun : a distinctive doctrine, cause, or theory

-ism noun suffix 1 : act : practice : process

2 : manner of action or behavior characteristic of a (specified) person or thing

3 : state : condition : property

4 : abnormal state or condition

5 : doctrine : theory : cult

6 : adherence to a set of principles

7 : prejudice or discrimination on the basis of a (specified) attribute

8 : characteristic or peculiar feature or trait

iso·bar noun : a line on a map connecting places of equal barometric pressure

— iso·bar·ic adjective

iso·late verb -lat·ed; -lat·ing [ORIGIN: fr. isolated set apart, fr. F isolé, fr. It isolato, fr. isola island, fr. L insula]

: to place or keep by itself : separate from others

Synonyms

cut off, insulate, seclude, segregate, separate, sequester; also quarantine; confine, immure, incarcerate, intern, jail, lock (up), restrain, restrict; detach, disengage, remove; detain, hold, keep

Antonyms

desegregate, integrate

iso·lat·ed adjective 1 : occurring alone or once : UNIQUE

2 : SPORADIC

3 : placed alone or apart

Synonyms

cloistered, covert, quiet, remote, secluded, secret—more at SECLUDED

iso·la·tion noun : the action of isolating : the condition