16 



GLOSSARY. 



Ar'cuate (Lat. arcus, a tow). Shaped 

 like a bow. 



A'rea (Lat. an open space). A plain 

 surface ; in geometry, the super- 

 ficial contents of any figure. 



Arena'ceous (Lat. arena, sand). 

 Sandy. 



Are'nicole (Lat. arena, sand ; colo, I 

 inhabit). An animal which inhabits 

 sand. 



Are'ola (Lat. area, an open space). 

 A small surface or space. 



Are'olar (Areola). Containing little 

 spaces ; applied to the connect- 

 ing tissue of the body, which 

 forms a number of little spaces or 

 interstices. 



Areom'eter (Gr. dpaios, araios, thin ; 

 fterpov, metron, a measure). An 

 instrument for measuring the spe- 

 cific gravity of liquids. 



Argentiferous (Lat. argen'tum, silver; 

 fero, I produce). Producing or con- 

 taining silver. 



Argil (Gr. dpyos, argos, white). Gen- 

 erally clay ; technically, pure clay 

 or alumina. 



Argilla'ceous (Lat. argil'la, white 

 clay). Consisting of argil or clay, 

 especially pure clay. 



Aril. In botany, the expansion of 

 the funiculus or placenta round the 

 seed, as the mace of a nutmeg. 



Aris'ta (Lat.). In botany, the beard 

 of corn and other grasses. 



Arithmetical mean. The middle 

 term of three numbers in arithme- 

 tical progression. 



Arithmetical progression. A series 

 of quantities increasing or decreas- 

 ing by the addition or subtraction of 

 the same number. 



Arithmetical ratio. The difference 

 between any two terms in arithme- 

 tical progression. 



Ar'mature (Lat. arma, arms). A sup- 

 ply of weapons ; applied, in physics, 

 to two pieces of soft iron fastened 

 to the poles of a magnet, and con- 

 nected at their ends by a third piece, 

 so as to increase its power. 



ArmiTlary (Lat. armilla, a bracelet). 

 Like a bracelet ; generally applied 

 to an artificial sphere composed of 

 a number of circles of the mun- 



dane sphere, placed in natural 

 order. 



Arrag'onite. A mineral consisting of 

 carbonate of lime, with some car- 

 bonate of strontia. 



Arrhi'zous (Gr. d, a, not ; pi fa rhiza, 

 a root). Without roots. 



Arse'niate (Arsenic). A salt of arsenic 

 acid with a base. 



Arsenic. In chemistry, applied to 

 an acid containing an equivalent 

 of metallic arsenic and five of oxy- 

 gen. 



Arse'nious (Ar'senic). In chemistry, 

 applied to an acid containing an 

 equivalent of metallic arsenic and 

 three of oxygen ; the common 

 arsenic of the shops. 



Ar'senite (Arsenic). A salt formed of 

 arsenious acid with a base. 



Arte'rial (Artery). Belonging to 

 an artery or to arteries. 



Arteri'tis (Lat. arteria, an artery ; 

 itis, denoting inflammation). In- 

 flammation of arteries. 



Ar'tery (Gr. arip, aer, air; r-nptca, 

 tereo, I keep ; because originally 

 supposed to contain air). A vessel 

 or tube which conveys blood in a 

 direction from the heart to all parts 

 of the body. 



Arte'sian (Lat. Artois, a province of 

 France). Artesian wells, supposed 

 to have been first made in Artois, 

 are perpendicular borings to a con- 

 siderable depth in the earth for 

 procuring water. 



Arthrit'ic (Arthritis). Relating to 

 inflammation of the joints, or gout. 



Arthritis (Gr. dpdpov, arthron, a 

 joint ; term, itis, inflammation). 

 Any inflammation of the joints ; 

 but specially applied to gout. 



Arthro'dia (Gr. dp6poca, arthroo, I fit 

 by joints). A joint in which the 

 head of one bone is received into 

 the socket of another ; a ball-and- 

 socket joint. 



Arthrodyn'ia (Gr. ap6pov, arthron, a 

 joint ; 6Suj/7j, odu'ne, pain). Pain 

 in the joints. 



Arthropod' aria (Gr. dpGpov, arthron, 

 a joint ; irovs, pous, a foot). A 

 term applied to those invertebrate 

 animals which have jointed limbs, 



