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B.-fat. i. The oilj portion of the milk of mammalia. 

 2. The fatty portion of butter, made up of the ids 

 cerids of oleic, palmitic, and stearii acidi (the so- 

 called insoluble acids), and the glycerids of butyric, 

 caproic, caprylic, and capric acid • illed 



soluble acids). The average proportion of the in- 

 soluble acids present in butter-fat is 88 per cent., and 

 the average proportion of the soluble acids from five 

 to six per cent. This gives a very important means 

 of distinguishing between a natural butter and oleo- 

 margarin. The pure fat has a sp. gr. of from .910 to 

 .914, and its melting -point varies from 85 to 92 F. 

 B.-fly, a winged pledget or tampon of cotton for 

 vaginal application. B.-fly Lupus. Synonym of 

 Lupus erythematosus. B. Kidney. See Amyloid 

 Kidney. B.-nut. See Juglans. 



Butterin [but'-er-in) [butyrum, butter]. An artificial 

 substitute for butter, made principally of beef-fat. See 

 Oleomargarin. 



Buttocks {but'-uks) [ME., buttok]. The nates. The 

 fleshy part of the body posterior to the hip-joints, 

 formed by the masses of the glutei muscles. 



Button {butf-un) [ME., boton\. See Furunculus orien- 

 talis. B., Amboyna. See Frambesia. B., Belly, 

 the navel. B., Biskra, the Aleppo (Veer. B., Cor- 

 rigan's, a steel button-shaped cautery-iron, introduced 

 by Sir J. C. Corrigan (1S02-80). B.-bush, the bark 

 of Cephalanthus occidentalism a tonic, febrifuge, and 

 diuretic. Dose of fid. ext. ^ss-j. Unof. B.-hole, 

 Mitral. See Funnel, Mitral. B.-hole Operation. 

 See Boutonniire Operation and Operations, Table of. 

 B.-lac. See Lac. B. -maker's Chorea. See Chorea. 

 B. -scurvy, a disease of privation, apparently similar 

 to sibbens or to yaws. B.-snakeroot, the root of 

 Liatris spicata, and of Eryngium yucccefolinm ; a 

 stimulant, tonic, diuretic, and emmenagogue. Dose 

 of fid. ext. 3 ss-j. Unof. 



Butyl (bu'-til) [butyrum, butter], C 4 H 9 . A hydro- 

 carbon alcohol radical, that cannot be isolated, and 

 that occurs only in combination with other radicals. 

 B. Chloral. See Chloral butylicum. B. -chloral 

 Hydrate. See Chloral butylicum. 



Butylamin {bu-til' '-am-in) [butyrum, butter; amin\. 

 Any primary amin of butyl. The butylamin of cod- 

 liver oil is said to be one of its medicinal con- 

 stituents. 



Butylene {bu'-til-in) [butyrum, butter], C 4 H 8 . A 

 hydrocarbon belonging to the olefin series. It exists 



in three isomeric forms, all of which are gases at 

 on li nary temperatures. 



Butyric Acid [bu Hi ' See Acid, Butyric. 



Butyrin {bu'-tii in) [butyrum, butter]. • .11 < ( ll 

 A constant constituent "i butter, together with olein, 

 stearin, and other glyi end-. It is a neutral yellowish 

 liquid fat, having a sharp, bitter taste. 



Butyrone [bu'-tir-on) [butyrum, butter], C-H u O. 

 Dipropyl ketone. The principal product of the distil- 

 lation of calcium butyrate. it boils at 144 and at 

 20 has a sp. gr. <■! .82 



Buxin {buks'-in\ [buxus, the box-tree]. Bibirin ; be- 

 beerin ; pelosin ; the alkaloid of Nectandra. It is a 

 white, amorphous powder with a persistent bitter ta 

 very insoluble in water, but easily soluble in alcohol and 

 chloroform. Dose of it or its salts, from grains three 

 to six in pill-form. It is used as a febrifuge. Unof. 



Buxton's Apparatus. See Anesthetic. 



Buxus [links' -us) [I.., the box-tree]. A genus of trees 

 affording boxwood. B. sempervirens, the common 

 box or box-tree of Europe and Asia. Its leaves, 

 wood, and oil have been employed in medicine. Unof. 



Buzzi's Operation. See Operations, Table of. 



Byrd's Method. See Artificial /Respiration. B. 

 Operation. See Operations. 'Table of. 



Byrne's Method. See Treatment, Methods of. 



Byrsa [bur'-sah). Same as Bursa. 



Bysma [biz'-mah) [/3bofia, a stopper ; plug :/>/., Bys- 

 mata~\. A plug or tampon. 



Byssaceous (bis-a' -she-its) [pvooog, a variety of flax]. 

 In biology, composed of fine flax-like threads. 



Byssinosis (bis-in-o'-sis) [fivooog, cotton, flax; / 

 disease]. A diseased condition of the lungs due to 

 the inhalation of cotton-dust in factories. 



Byssocausis (bis-o-kaw* -sis) [fivaaog, cotton; icavo 

 a burning]. Cauterization by the moxa ; moxibustion. 



Byssogenous [bis-of -en-us) [iir.rnc, cotton; yivr/c, 

 producing]. In biology, producing a byssus. 



Byssus (bis'-us) [liioaor, cotton, flax]. 1. Charpie, 

 lint, or cotton. 2. The hairy growth of the pubic 

 region. 3. In biology, a bunch of silky filaments 

 secreted by the foot, in several molluscs. A name 

 formerly given to the mycelium of large fungi. B. 

 Gland. See Gland. 



Byssys ibis' -is) [(ivooog, flax]. Same as Byssus. B. 

 Gland. See Gland. 



Bythus [bith'-us) [,3uft5f, the depth]. The lower or 

 vesical portion of the abdomen. 



