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aqua noun : a light greenish blue color

aqua·cul·ture also aqui·cul·ture noun : the cultivation of aquatic plants or animals (as fish or shellfish) for human use

aqua·ma·rine noun 1 : a bluish green gem

2 : a pale blue to light greenish blue

aqua·naut noun : a person who lives in an underwater shelter for an extended period

aqua·plane noun : a board towed behind a motorboat and ridden by a person standing on it

— aquaplane verb

aqua re·gia noun [ORIGIN: NL, lit., royal water]

: a mixture of nitric and hydrochloric acids that dissolves gold or platinum

aquar·i·um noun, plural -i·ums or -ia 1 : a container (as a glass tank) in which living aquatic animals or plants are kept

2 : a place where aquatic animals and plants are kept and shown

Aquar·i·us noun [ORIGIN: L, lit., water carrier]

1 : a zodiacal constellation between Capricorn and Pisces usu. pictured as a man pouring water

2 : the 11th sign of the zodiac in astrology; also : one born under this sign

1aquatic adjective 1 : growing or living in or frequenting water

2 : performed in or on water

2aquatic noun : an aquatic animal or plant

aqua·vit noun : a clear liquor flavored with caraway seeds

aqua vi·tae noun [ORIGIN: ME, fr. ML, lit., water of life]

: a strong alcoholic liquor (as brandy)

aq·ue·duct noun 1 : a conduit for carrying running water

2 : a structure carrying a canal over a river or hollow

3 : a passage in a bodily part

Synonyms

canal, channel, conduit, flume, raceway, watercourse—more at CHANNEL

aque·ous adjective 1 : WATERY

2 : made of, by, or with water

aqueous humor noun : a clear fluid occupying the space between the lens and the cornea of the eye

aqui·fer noun : a water-bearing stratum of permeable rock, sand, or gravel

aq·ui·line adjective 1 : of or resembling an eagle

2 : hooked like an eagle's beak

ar abbreviation arrival; arrive

Ar symbol argon

AR abbreviation Arkansas

-ar adjective suffix 1 : of or relating to : being

2 : resembling

Ar·ab noun 1 : a member of a Semitic people of the Arabian peninsula in southwestern Asia

2 : a member of an Arabic-speaking people

— Arab adjective

— Ara·bi·an adjective or noun

ar·a·besque noun : a design of interlacing lines forming figures of flowers, foliage, and sometimes animals

— arabesque adjective

1Arabic noun : a Semitic language of southwestern Asia and northern Africa

2Arabic adjective 1 : of or relating to the Arabs, Arabic, or the Arabian peninsula in southwestern Asia

2 : expressed in or making use of Arabic numerals

Arabic numeral noun : any of the number symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

ar·a·ble adjective : fit for or used for the growing of crops

arach·nid noun : any of a class of usu. 8-legged arthropods comprising the spiders, scorpions, mites, and ticks

— arachnid adjective

Ar·a·ma·ic noun : an ancient Semitic language

ar·a·mid noun : any of several light but very strong heat-resistant synthetic materials used esp. in textiles and plastics

Arap·a·ho or Arap·a·hoe noun, plural -ho or -hos or -hoe or -hoes : a member of an American Indian people of the western U.S.

ar·bi·ter noun : one having power to decide a dispute

Synonyms

arbitrator, judge, referee, umpire—more at JUDGE

arbitrator, go-between, intercessor, intermediary, mediator, middleman, peacemaker—more at MEDIATOR

ar·bi·trage noun [ORIGIN: F, fr. MF, arbitration]

: the purchase and sale of the same or equivalent securities in different markets in order to profit from price discrepancies

ar·bi·tra·geur or ar·bi·trag·er noun : one who practices arbitrage

ar·bit·ra·ment noun 1 : the act of deciding a dispute

2 : the judgment given by an arbitrator

ar·bi·trary adjective 1 : marked by or resulting from the unrestrained and often tyrannical exercise of power

2 : determined by will or caprice : selected at random

— ar·bi·trari·ly adverb

— ar·bi·trari·ness noun