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chair·per·son noun : the presiding officer of a meeting or assembly : CHAIRMAN

chair·wom·an noun : a woman who serves as chairman

chaise noun : a 2-wheeled horse-drawn carriage with a folding top

chaise longue noun, plural chaise longues [ORIGIN: F, lit., long chair]

: a long reclining chair

chaise lounge noun : CHAISE LONGUE

chal·ced·o·ny noun, plural -nies : a translucent pale blue or gray quartz

chal·co·py·rite noun : a yellow mineral constituting an important ore of copper

cha·let noun 1 : a herdsman's cabin in the Swiss mountains

2 a : a building in the style of a Swiss cottage with a wide roof overhang

b : a cottage or house in chalet style

Synonyms

cabin, camp, cottage, lodge—more at COTTAGE

chal·ice noun : a drinking cup; especially : the eucharistic cup

1chalk noun 1 : a soft limestone

2 : chalk or chalky material esp. when used as a crayon

— chalky adjective

2chalk verb 1 : to rub or mark with chalk

2 : to record with or as if with chalk — usu. used with up

chalk·board noun : BLACKBOARD

chalk up verb 1 : ASCRIBE, CREDIT

2 : ATTAIN, ACHIEVE

1challenge verb chal·lenged; chal·leng·ing [ORIGIN: ME chalengen to accuse, fr. OF chalengier, fr. L calumniari to accuse falsely, fr. calumnia calumny]

1 : to order to halt and prove identity

2 : to dispute esp. as being unjust, invalid, or untrue : to take exception to : DISPUTE

3 : to issue an invitation to compete against one esp. in single combat : DARE, DEFY

Synonyms

[2] contest, dispute, query, question; also doubt, mistrust; kick (about), object (to), protest; combat, fight, oppose, resist

Antonyms

accept, believe, embrace, swallow

[3] dare, defy; also beard, brave, brazen, breast, confront, face

2challenge noun 1 : a summons to a duel

2 : an invitation to compete in a sport

3 : a calling to account or into question

4 : an exception taken to a juror

5 : a sentry's command to halt and prove identity

6 : a stimulating or interesting task or problem

Synonyms

complaint, demur, expostulation, fuss, kick, objection, protest, question, remonstrance—more at OBJECTION

challenged adjective : presented with difficulties (as by a disability)

Synonyms

disabled, handicapped—more at DISABLED

chal·leng·er noun : one that challenges; specif : a contender for a championship (as boxing)

Synonyms

competition, competitor, contender, contestant, rival—more at COMPETITOR

challenging adjective : arousing competitive interest, thought, or action

Synonyms

arduous, burdensome, demanding, exacting, grueling, laborious, onerous, taxing, toilsome—more at DEMANDING

chal·lis noun, plural chal·lises : a lightweight clothing fabric of wool, cotton, or synthetic yarns

cham·ber noun 1 : a partitioned part of the inside of a building : ROOM

2 : an enclosed space or cavity

3 : a hall for meetings of a legislative body

4 : a judge's consultation room — usu. used in pl.

5 : a legislative or judicial body; also : a council for a business purpose

6 : the part of a firearm that holds the cartridge or powder charge during firing

— cham·bered adjective

Synonyms

[1, 2] bay, cabin, cell, compartment, cubicle—more at COMPARTMENT

cham·ber·lain noun 1 : a chief officer in the household of a king or nobleman

2 : TREASURER

cham·ber·maid noun : a maid who takes care of bedrooms

chamber music noun : music intended for performance by a few musicians before a small audience

cham·bray noun : a lightweight clothing fabric of white and colored threads

cha·me·leon noun [ORIGIN: ME camelion, fr. MF, fr. L chamaeleon, fr. Gk chamaileōn, fr. chamai on the ground + leōn lion]

: a small lizard whose skin changes color esp. according to its surroundings

1chamfer verb 1 : to cut a furrow in (as a column) : GROOVE

2 : to make a chamfer on : BEVEL

2chamfer noun : a beveled edge

cham·ois noun, plural cham·ois 1 : a small goatlike antelope of Europe and the Caucasus region of Russia

2 also cham