ARCIFORM 



108 



ARGENTUM 



Arciform (ar> '-se- form) [arcus, bow, arch ; forma, 

 form] . Bow-shaped ; especially used to designate 

 certain sets of fibers in the oblongata. 



Arctation (ark-ta'-shun) [arctatio ; arctare, to draw 

 close together]. I. Contraction or lessening of an 

 opening or of the lumen of a canal. 2. Infibulation. 



Arctium (ark' -ske-um) [L.]. Burdock. See Lappa. 



Arctostaphylos (ark-to-staf'-il-os). See Uva ursi 

 and Manzanita. 



Arcual (ar'-ku-al) [arcualis, arched]. Arched; bent 

 or curved. 



Arcuate (ar'-ku-at) [arcuatio, a bowing] . Arched ; 

 curved ; bow-shaped. 



Arcuation (ar-ku-a' -shun) [arcuatio, a bowing] . Curva- 

 ture of any bone, as of the tibia or sternum ; curvature 

 of the vertebral column. 



Arcuatus (ar-ku-a' -tus) [arcus, a bow]. Bent or 

 curved in an arched form. A. morbus, a former 

 name for jaundice. 



Arculus (ar'-ku-lus) [dim. of arcus, a bow] . An 

 arching support for bed-clothes. 



Arcus (ar'-kus) [arcus, a bow] . A bow or arch. A. 

 dentalis, the dental arch. A. senilis, in the old, the 

 ring of fatty degeneration of the corneal tissue about 

 the periphery. A. zygomaticus, the zygomatic arch. 



Ardent (ar'-denf) [ardere, ardens, to burn] . Burning ; 

 fiery ; glowing ; accompanied by a sensation of burn- 

 ing. A. Fever, heat fever or thermal fever. A. 

 Spirits, alcoholic liquors. See Spiritus. 



Ardor (ar'-dor) [ardor, heat]. Violent heat, burning; 

 applied to fevers and the sexual passion. A. urinae, 

 burning pain in the inflamed urethra during micturition. 



Area(V '-re-ah) [area, an open space]. Any space with 

 boundaries. A. celsi. See Alopecia areata. A's., 

 Cohnheim's, certain clear-cut areas seen in a trans- 

 verse section of muscle-fiber. A., Crural, a space 

 at the base of the brain included between the pons 

 and chiasm. A. germinativa, or embryonic spot, 

 the oval germinating spot of the embryo. A. opaca, 

 the opaque circle about the A. pellucida. A. pellu- 

 cida, the light central portion of the A. germinativa. 

 A., Postpontile, the ventral aspect of the mesen- 

 cephalon. A. vasculosa, the vascularization of the 

 A. opaca. 



Areca Nut (ar'-ek-ah). See Betel. 



Arecane, Arekane (ar'-ek-dn) [Malay]. An oily and 

 volatile basic substance obtainable from areca nut ; said 

 to be a purgative and sialagogue, and to slow the 

 pulse. Unof. 



Arecin (ar'-es-in) [Sp., areca"], C 23 H 26 N 2 0. A brown- 

 red coloring matter, obtained from areca nuts ; areca 

 red. 



Arecolin (ar-e'-ko-lin) [Sp., areca], C 8 H 13 N0 2 . A 

 liquid alkaloid isolated from the seeds of Areca cate- 

 chu. It is strongly alkaline, very soluble in water, 

 alcohol, ether, or chloroform, and boils at 220 C. 

 It is a powerful poison, affecting the heart similarly to 

 muscarin. It has anthelmintic properties. Dose gr. 



Arefaction (ar-e-fak'-shun) [arefaclio ; arefacere, to 

 make dry]. I. Exsiccation or desiccation. The removal 

 of the structural or constitutional water from a sub- 

 stance. 2. The drying of drugs before powdering 

 them. 3. Dryness, as of the skin. 4. Withering, 

 as of a paralyzed limb. 



Arena (ar-e'-nah) [arena, sand]. I. Brick-dust deposit 

 from urine ; gravel. 2. Sabulous matter ; brain-sand. 



Arenaceous (ar-e-na'-se-us) [arena ecus ; arena, sand]. 

 Of the nature of sand or gravel ; sabulous. 



Arenation (ar-e-na' -shun) [arena, sand]. A sand-bath. 

 The application of hot sand to a limb or part of the 

 body. See Ammotherapy. 



Areola (ar-e' -o-lah) [dim. of area, an open space://., 

 Areola]. 1. The brownish space surrounding the 

 nipple of the female breast. This is sometimes called 

 Areola papillaris. A secondary areola, surrounding 

 this, occurs during pregnancy. The pigmentation 

 about the umbilicus is called the umbilical areola. 2. 

 Any interstice or minute space in a tissue. 



Areolar (ar-e'-o-lar) [areola, dim. of area, an open 

 space]. Relating to or characterized by areolae. A. 

 Tissue, cellular tissue ; connective tissue. 



Areolate, or Areolated (ar-e'-o-ldt, or ar-e' -o-la-ted) 

 [areola, dim. of area, an open space]. Marked or 

 characterized by areola. 



Areometer (ar-e-om'-et-er) [apaidg, thin, light ; fihpov, 

 a measure]. An instrument for estimating the specific 

 gravity or strength of liquids, especially alcoholic 

 liquids. 



Areometry (ar-e-om' -et-re) [apai6q, thin, light ; /uerpov, 

 a measure] . The use of the areometer ; estimation of 

 the specific gravity of fluids. 



Areotic (ar-e-ot'-ik) [apaidg, thin]. I. Attenuant ; 

 thinning the humors ; increasing perspiration. 2. An 

 attenuant remedy. 



Arethusa (ar-eth-u'-sak) [' Apedovva, a fountain]. A 

 genus of orchidaceous plants. A. bulbosa, of North 

 America, has root-tubes that are popularly used as 

 a material for poultices, and are said to form a useful 

 application for toothache. Unof. 



Arevareva (ar-a-var-a' -vah) [Tahitian]. A scaly 

 skin-disease said to be caused by the habitual use of 

 the drug Kava, q. v. It is accompanied by eye-disease, 

 with dimness of vision. 



Argal (ar'-gal). See Argol. 



Argamblyopia (ar-gam-ble-o'-pe-ah) [apy6g, idle, dis- 

 used ; afifiAvunia, dim-sightedness]. Amblyopia due 

 to disuse of the eye. 



Argamblyopic (ar-gam-ble-op'-ik) [apydg, idle ; 

 d/ifiAvuKia, dim-sightedness]. Affected with argam- 

 blyopia. 



Argand-lamp. A form of lamp with a tubular wick. 



Argan-oil (ar'-gan-oil) [Arab., argdn]. An oil 

 derived from the seeds contained in the fruit of the 

 argan-tree. It is a good substitute for olive-oil. 



Argan-tree (ar'-gan-tre) [Arab., argdn]. The 

 Argania sideroxylon, an evergreen tree of the N. W. 

 of Africa, order Sapotacece ; it yields a useful oil. 



Argel (ar'-gel) [Syrian]. A plant, Solenostemma 

 argel, of the eastern Mediterranean region ; also its 

 leaves, which are used to adulterate senna ; also the 

 Gomf</iocarpus frulicosus, of Africa, whose leaves are 

 similarly employed. Unof. 



Argema (ar'-jem-ah) [apyc/ua, an ulcer : //. , Argemata] . 

 A white ulcer of the margin of the cornea, following 

 phlyctenula. 



Argemone (ar-jem-o'-ne) [apyejiov, an ulcer]. A genus 

 of plants. A. mexicana, the horned or prickly 

 poppy, a plant native to North America. It is said to 

 have hypnotic qualities, and its seeds afford a purga- 

 tive oil. Unof. 



Argentation (ar-jen-ta'-shun) [argenlum, silver]. 

 Staining with a preparation of silver. 



Argentic (ar-jen'-tik) [argentum, silver]. Pertaining 

 to, or of the nature of silver. Containing silver as a 

 univalent radical. 



Argentine (ar'-jen-tin) [argentum, silver]. Contain- 

 ing or resembling silver. 



Argentum (ar-jen'-tum) [L. : gen., Argent/"]. Silver. 

 Ag=lo8; quantivalence, 1. A malleable and ductile 

 metal of brilliant white luster. It tarnishes only in the 

 presence of free sulphur, sulphur gases, and phosphorus. 

 It is an excellent substance for vessels used in pharmacy 

 and for sutures used in surgery. The following salts 



