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ace·tyl·sal·i·cyl·ic acid noun : ASPIRIN 1

1ache verb ached; ach·ing 1 : to suffer a usu. dull persistent pain

2 : to experience a painful eagerness or yearning : LONG, YEARN

— ache noun

Synonyms

[1] hurt, pain, smart—more at HURT

[2] die, hanker, hunger, itch, long, pant, pine, sigh, thirst, yearn

usually ache for [2] crave, desire, die, hunger, long, pine, thirst, want, wish, yearn—more at DESIRE

2ache noun : a usu. dull persistent pain

Synonyms

pain, pang, prick, smart, sting, stitch, tingle, twinge—more at PAIN

achiev·able adjective : capable of being achieved

Synonyms

attainable, doable, feasible, possible, practicable, realizable, viable, workable—more at POSSIBLE

achieve verb achieved; achiev·ing [ORIGIN: ME acheven, fr. AF achever to finish, fr. a- to (fr. L ad-) + chef end, head, fr. L caput]

1 : to carry out successfully : ACCOMPLISH

2 : to gain by work or effort

— achiev·er noun

Synonyms

[1] accomplish, carry out, commit, compass, do, execute, follow through, fulfill, make, perform—more at PERFORM

[2] attain, hit, make, score, win; also acquire, capture, carry, draw, garner, get, land, make, obtain, procure, realize, secure

achieve·ment noun 1 : the act of achieving

2 : a result gained by effort

Synonyms

[1] accomplishment, attainment, success

[2] accomplishment, attainment, coup, success, triumph—more at ACCOMPLISHMENT

Achil·les' heel noun [ORIGIN: fr. the story that the Greek warrior Achilles was vulnerable only in the heel]

: a vulnerable point

Achil·les tendon noun : the tendon joining the muscles in the calf of the leg to the bone of the heel

ach·ro·mat·ic adjective : giving an image almost free from extraneous colors <~ lens>

achy adjective ach·i·er; ach·i·est : afflicted with aches

— ach·i·ness noun

1acid adjective 1 : sour or biting to the taste; also : sharp or sour in manner

2 : of or relating to an acid

— acid·ly adverb

Synonyms

sour, tart, vinegary—more at SOUR

2acid noun 1 : a sour substance

2 : a usu. water-soluble chemical compound that has a sour taste, reacts with a base to form a salt, and reddens litmus

3 : LSD

acid·ic adjective : sour or biting to the taste; also : sharp or sour in manner

acid·i·fy verb -fied; -fy·ing 1 : to make or become acid

2 : to change into an acid

— acid·i·fi·ca·tion noun

acid·i·ty noun : the quality, state, or degree of being acid

Synonyms

acrimony, asperity, bitterness, cattiness, tartness, virulence, vitriol—more at ACRIMONY

ac·i·do·sis noun, plural -do·ses : an abnormal state of reduced alkalinity of the blood and body tissues

acid precipitation noun : precipitation with above normal acidity that is caused esp. by atmospheric pollutants

acid rain noun : acid precipitation in the form of rain

acid test noun : a severe or crucial test

acid·u·lous adjective : somewhat acid or harsh in taste or manner

ack abbreviation acknowledge; acknowledgment

ac·knowl·edge verb -edged; -edg·ing 1 : to recognize the rights or authority of

2 : to admit as true

3 : to express thanks for; also : to report receipt of

4 : to recognize as genuine or valid

Synonyms

admit, agree, allow, concede, confess, grant, own—more at ADMIT

ac·knowl·edg·ment or ac·knowl·edge·ment noun 1 : the act of acknowledging

2 : recognition or favorable notice of an act or achievement

Synonyms

admission, avowal, concession, confession—more at CONFESSION

ACL noun : ANTERIOR CRUCIATE LIGAMENT

ACLU abbreviation American Civil Liberties Union

ac·me noun [ORIGIN: Gk akmē]

: the highest point

Synonyms

apex, climax, crown, culmination, head, height, meridian, peak, pinnacle, summit, tip-top, top, zenith—more at HEIGHT

ac·ne noun [ORIGIN: Gk aknē, MS var. of akmē, lit., point]

: a skin disorder marked by inflammation of skin glands and hair follicles and by pimple formation esp. on the face

ac·o·lyte noun 1 : one who assists