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aquarium (n.)[aquarium 词源字典]: 1830, noun use of neuter of Latin aquarius "pertaining to water," as a noun, "water-carrier," genitive of aqua "water" (see aqua-). The word existed in Latin, but there it meant "drinking place for cattle." Originally especially for growing aquatic plants; An earlier attempt at a name for "fish tank" was marine vivarium.[aquarium etymology, aquarium origin, 英语词源]
Aquarius: faint constellation and 11th zodiac sign, late Old English, from Latin aquarius, literally "water carrier," properly an adjective, "pertaining to water" (see aquarium); a loan-translation of Greek Hydrokhoos "the water-pourer," old Greek name of this constellation.

Aquarians were a former Christian sect that used water instead of wine at the Lord's Supper. Age of Aquarius (1940) is an astrological epoch supposed to have begun in the 1960s, embodying the traits of this sign and characterized by world peace and human brotherhood. The term and the concept probably got a boost in popular use when An Aquarian Exposition was used as the sub-name of the Woodstock Music & Art Fair (1969).
aquatic (adj.): late 15c., from Middle French and Old French aquatique (13c.), from Latin aquaticus "growing in water; bringing rain," from aqua "water" (see aqua-)
aquatint (n.): 1782, "engraving made with aqua fortis," from Italian acquatinta, from Latin aqua tincta "dyed water;" see aqua- + tinct.
aqueduct (n.): 1530s, from Latin aquaeductus "conveyance of water," from aquae, genitive of aqua "water" (see aqua-), + ductus "a leading, conducting," past participle of ducere "to lead" (see duke (n.)).
aqueous (adj.): 1640s, from Latin aqua "water" (see aqua-) on analogy of French aqueux "watery" (16c., which, however, is from Late Latin aquosus "abounding in water"). Or by analogy of Latin terreus "earthy," from terra "earth." Aqueous humor is the original use in English.
aquifer (n.): 1897, coined from Latin aqui-, comb. form of aqua "water" (see aqua-) + -fer "bearing," from ferre "to bear" (see infer).
aquiline (adj.): "curved like an eagle's beak," 1640s, originally in English in reference to long, hooked noses, from Latin aquilinus "of or like an eagle," from aquila "eagle," of uncertain origin, usually explained as "the dark bird;" compare aquilus "blackish, of the color of darkness."
aquiver (adv.): 1864, from a- (1) + quiver (v.).
Arab (n.): late 14c. (Arabes, a plural form), from Old French Arabi, from Latin Arabs (accusative Arabem), from Greek Araps (genitive Arabos), from Arabic 'arab, indigenous name of the people, perhaps literally "inhabitant of the desert" and related to Hebrew arabha "desert." Meaning "homeless little wanderer, child of the street" is from 1848 (originally Arab of the city), in reference to nomadic ways. Arab League formed in Cairo, March 22, 1945.
arabesque (n.): 1610s, "Moorish or Arabic ornamental design," from French arabesque (16c.), from Italian arabesco, from Arabo "Arab," with reference to Moorish architecture. As a ballet pose, first attested 1830. Musical sense, in reference to an ornamented theme, is from 1864, originally the title given by Robert Schumann to one of his piano pieces.
Arabia: 1711; see Arab + -ia. The older name for "the country of Arabia" was Araby (late 13c.).
Arabian: c. 1300, adjective and noun; see Arab + -ian. As a prized type of horse, it is attested from 1660s. The Arabian bird was the phoenix.
Arabic (adj.): early 14c., from Old French Arabique (13c.), from Latin Arabicus "Arabic" (see Arab). Old English used Arabisc "Arabish." Originally in reference to gum arabic; noun meaning "Arabic language" is from late 14c.

Arabic numerals (actually Indian) first attested 1727; they were introduced in Europe by Gerbert of Aurillac (later Pope Sylvester II) after a visit to Islamic Spain in 967-970. A prominent man of science, he taught in the diocesan school at Reims, but the numbers made little headway against conservative opposition in the Church until after the Crusades. The earliest depiction of them in English, in "The Crafte of Nombrynge" (c. 1350) correctly identifies them as "teen figurys of Inde."
arable (adj.): early 15c., "suitable for plowing" (as opposed to pasture- or wood-land), from Old French arable (12c.), from Latin arabilis, from arare "to plow," from PIE *are- "to plow" (cognates: Greek aroun, Old Church Slavonic orja, Lithuanian ariu "to plow;" Gothic arjan, Old English erian, Middle Irish airim, Welsh arddu "to plow;" Old Norse arþr "a plow"). By late 18c. it replaced native erable, from Old English erian "to plow," from the same PIE source.
arachnid (n.): "a spider," 1869, from French arachnide (1806) or Modern Latin Arachnida, introduced as name for this class of arthropods 1815 by French biologist Jean Baptiste Pierre Antoine de Monet de Lamarck (1744-1829), from Greek arakhne (fem.) "spider; spider's web," which probably is cognate with Latin aranea "spider, spider's web" (borrowed in Old English as renge "spider"), from aracsna. The Latin word could be a Greek borrowing or both could be from a common root. An earlier noun form was arachnidian (1828).
arachnoid (adj.): "cobweb-like," especially of the membrane around the brain and spinal cord, 1789, from Modern Latin arachnoides, from Greek arakhnoeides "cobweb-like," from arakhne "cobweb" (see arachnid) + -oeides (see -oid).
arachnologist (n.): student of spiders, 1806; see arachnid + -ology. Related: Arachnology.
arachnophobia (n.): 1925, from comb. form of arachnid + -phobia "fear."
Aragon: medieval Spanish kingdom, named for a river that runs through it, probably from a PIE root meaning "water."