A Q U 



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A R G 



ACIUA'RIUS. The water-bearer, or eleventh 

 sign in the zodiac. A constellation which 

 is supposed to have obtained this name 

 from the opinion that its rising brings 

 with it an abundance of rain. It rises in 

 January and sets in February. This 

 constellation contains, according to Pto- 

 lemy and Kepler 45 stars, but according 

 to Flamsted 108. 



ACIUA'TIC. "1 (aquaticus, Lat. aquatique, 



AQUA'TICAL. \ Fr. aquatico, It.) Relat- 



ACIUA'TICK. j ing to the water ; that in- 

 habits, or frequents, the water ; that grows 

 in the water. 



A'QUATILE. (aquatilis, Lat. aquatile, Fr. 

 aquatile, It.) See Aquatic. 



A'auEous. (aqueus, Lat. aqueux, Fr. 

 acquoso, It.) Watery. 



A'QUEOUSNESS. Waterishness. 



ARA'CHNIDA. } (from apd^vrj and t iSog , 



ARA'CHNIDAN. 5 Gr. resembling a spider.) 

 The arachnida are members of that series 

 of aunulose animals possessing jointed 

 feet, and belong to the third class of arti- 

 culated animals. The two great families 

 in the higher order of living arachnidans 

 are spiders and scorpions. Buckland. 

 In the arrangement of Cuvier, the ara- 

 chnidans compose the second class of 

 articulated animals provided with move- 

 able feet. They have no wings, and do 

 not undergo any metamorphosis, merely 

 casting their skin. The majority of the 

 arachnidans feed on insects ; some are 

 parasitical, living on vertebrated animals ; 

 others are found in flour, in cheese, and 

 on vegetables. Cuvier has divided the 

 arachnidans into two orders, Pulmonarise 

 and Tracheariffi ; the former he subdi- 

 vided into families, Araneides and Pedi- 

 palpi ; the latter into three families, 

 Pseudo-Scorpiones, Pycnogonides, and 

 Holetra. 



ARACHNOI'D. 



ARACHNOI'DES. 



1. A cobweb-like membrane, forming one 

 of the tunics or coats of the brain. 



2. One of the tunics, or coats, of the eye. 



3. A species of fossil madrepore. 

 ARBORE'OUS. (arloreus, Lat.) 



1. Belonging to trees ; resembling trees. 



2. A term used to distinguish such 

 mosses, or funguses, as grow upon trees, 

 from those that grow on the ground. 



ARBORE'SCENCE. (from arboresco, Lat.) 

 The likeness of a tree, frequently ob- 

 served in crystallizations and in mineral 

 productions. 



ARBORE'SCENT. Resembling a tree ; grow- 

 ing like a tree ; becoming woody. 



ARC OF A CIRCLE. An arc of a circle is 

 any part of its circumference ; and the 

 chord, or subtense of an arc, is a straight 

 line joining the two extremities of that 

 arc. 



A'RCHED. (arcuatus, Lat.) In the form 



of a bow. 

 A'RCA. A transverse inequilateral shell : 



the beaks distant ; the hinge with many 



teeth disposed in a straight line. These 



are marine shells. Lamarck particularizes 



seven species. 



ARCH^EOLO'GICAL. ) Relating to a discourse 

 ARCHEOLO'GICAL. $ on antiquity. 

 ARCH^O'LOGY. ) from dp^atoc, ancient, and 

 ARCHEO'LOGY. $ Xoyog, discourse, Gr.) A 



discourse on subjects connected with anti- 



quity ; the science which treats of anti- 



quities. 

 A'RCHETYPK. (archetype, Fr.) The ori- 



ginal of which any resemblance is made. 

 A'RCTIC. ) (from a/o/crog, ursus ; arctique, 

 A'RCTICK. $ Fr. artico, It.) Northern; 



lying under the arctos, or bear. 

 A'RCTIC CIRCLE. One of the lesser circles 



of the sphere, twenty-three degrees and 



twenty-eight minutes from the north pole. 



The circle at which the northern frigid 



zone begins. This and its opposite, the 



antarctic, are called the two polar circles. 

 A'RCUATE. (arcuatus, Lat.) Bent like a 



bow ; in the form of an arch ; incurvated. 

 A'RCUATILE. (arcuatilis, Lat.) Bent in 



the form of an arch ; crooked like a bow ; 



bowed. 

 ARCUA'TION. The act of bending anything ; 



the state of being bent in the form of an 



arch ; curving ; bending. 

 A'RCUATURE. The curvature of an arch. 

 A'REA. (area, Lat.) The surface con- 



tained between lines and boundaries. 

 AREFA'CTION. (from arefacio, Lat.) The 



state of growing day ; the act of drying. 

 A'REFY. To dry ; to free from moisture. 

 ARENA'CEOUS. (arenaceus, Lat.) Sandy; 



having the properties, or appearance, of 



sand. 

 ARENILI'TIC. Resembling sandstone ; hav- 



ing the quality of sandstone ; composed 



of sandstone. 



ARE'N ALDUS. Full of sand ; sandy ; gra- 



velly. 

 AREO'METER. (fromapaiog, and/urpsw, Gr. 



areometre, Fr.) An instrument for mea- 



suring the density or weight of any liquid. 

 AREO'METRY. The art of measuring the 



density or gravity of fluids. 

 A'RGAL. Crude tartar, as deposited by 



vinous fermentation. 

 ARGE'NTAL. (from argentum, Lat.) Con- 



taining silver ; combined with silver.) 

 ARGENTIFEROUS. (from argentum and 



fero, Lat.) Producing silver. 

 ARGENTINA. A genus of fishes of the 



order of abdominales. 

 ARGE'NTINE. (aroentin, Fr.) Appearing 



like silver ; resembling silver. 

 ARGE'NTINE. Slate-spar ; a mineral of 



