VELLICATE 



1595 



VENTILATION 



Vellicate (yel'-ik-at) \yellicare, to pluck]. To twitch ; 

 to move spasmodically. 



Vellication (yel -ik - a'- shun) [yellicatio ; vetticare, to 

 twitch]. The spasmodic twitching of muscular fibers 

 as observed in tic. 



Velpeau's Apparatus. An immovable dressing for 

 fractures, consisting of a compress and card-board 

 splints, hardened by a solution of dextrin. V.'s 

 Bandage. See Bandage. V.'s Hernia, femoral 

 hernia in front of the vessels. See Hernia, and Dis- 

 eases, Table of. 



Velum ye'-luni) [velum, veil, sail://., Vela~\. In 

 biology, a veil or veil-like structure, variously applied 

 to membranous growths in both plants and animals, 

 as the swimming-membrane of molluscan larvae ; the 

 turned-in margin of the umbrella of certain medusae, or 

 the envelop covering the sphorophore of a hymeno- 

 mvcetous fungus. V. interpositum, the membranous 

 f of the third ventricle. V. palati. Same as V. 

 'iilum palati. V. partiale, a membrane or veil 

 hich in some of the Hymenomycetes stretches from 

 margin of the pileus to the stipe. V. pendulum 

 ati, the soft palate, and especially the uvula. V., 

 sterior Medullary, the commissure of the flocculus 

 f the cerebellum. V. tarini. Same as V., Posterior 

 Medullary. V. universale, a membrane which in 

 some of the Hymenomycetes covers the entire sporo- 

 carp. 



Velumen [ye-lu'-men) \yelumen, a fleece]. In biology, 

 the velvety integument of certain parts of plants or 

 animals. 



Velutinous (ve-lu'-tin-us) [yelutem, velvet]. Velvety 

 to the touch. 



Venae e'-nah) [L.]. A vein. See Vein. V. cava. 

 See Cava. Vena cava inferior, is formed by the 

 junction of the two common iliac veins and empties 

 into the right auricle of the heart. It receives lumbar, 

 right spermatic, renal, suprarenal, phrenic, and hepatic 

 branches. Vena cava superior, formed by the union 

 of the innominate veins, conveys the blood from the 

 upper half of the body to the right auricle. 



Venae (ye' -tie). Plural of Vena. Veins. See Vein. 

 Venae comites, veins that accompany arteries in their 

 course. V. Galeni, the two trunks formed by the 



I union of the vein of the corpus striatum and that of 

 the choroid plexus ; they empty into the straight 

 sinus. V. thebesii, the small veins by which blood 

 passes from the walls of the heart to the right auricle. 

 Venae vorticosae, the venous network and trunks of 

 the choroid coat of the eye. 

 Venal (ye'-nal). Same as Venous. 

 Venalization (yen-al-iz-a' -shun) [vena, vein]. The 



acquirement of venous qualities by the blood. 

 Venatio yen-a' -she-o) [venari, to hunt]. I. Same as 



Venation. 2. A hunting. 

 Venation [ven-a' -shun) [vena, a vein]. In biology, 

 the distribution of veins in a leaf, or in the wing of an 

 insect. See Nervation. V., Forked, venation in 

 which the veins branch in repeated equal divisions. 

 V., Reticulate, venation in which the veins have the 

 form of a network. V., Unbranched, venation in 

 which the veins run parallel and unconnected from 

 the base to the tip of a leaf. 

 Venenate {yen' - en - at) [yenenum, poison]. Poison- 

 ous. 

 Venenation (yen- en -a' -shun) [yenenum, a poison]. 

 The condition of one affected by the venom of a 

 poisonous insect or reptile. 

 Venenatus (yen - en - a' - tus) [yenenum, a poison]. 



Poisonous. 

 Venenific (yen-en-if'-ik) [yenenum, poison]. Poison- 

 forming. 



Venenifluous yen-en-if -lu-us) [yenenum, poison 

 flttere, to flow]. In biology, exuding a poisonous 

 fluid or juice. 



Venenose, Venenous (yen'-en-oz, ven'-en-us) [venen- 

 osus~\. Toxic; poisonous; acting by a toxic property. 



Venenum yen'-en-um). Same as Poison. 



Venereal yen-e'-re-al) [Venus, the goddess of love]. 

 Pertaining to the sexual passion. V. Bubo, a swel- 

 ling of the glands of the groin secondary to some 

 venereal disease. V. Diseases, gonorrhea, syphilis, 

 and chancroid. V. Sore. See Chancre. V. Wart. 

 See Verruca acuminata. 



Venereology (ven-e-re-ol'-o-je) [ Venus, the goddess of 

 love ; t.oyoc, science]. The science of venereal dis- 

 ease. 



Venery (t en' -er-e) [ Venus, the goddess of love]. Sexual 

 intercourse. 



Venesection (zen-e-seh'-shun). See Blood-letting. 



Venesuture yen-e-su'-tur) [vena, vein ; sutura, su- 

 ture]. The suturing of a vein. 



Venetian Red. See Pigments, Conspectus of. 



Venice (ven'-is) [Ital.]. A city of Italy. V. Treacle, 

 V. Turpentine. See Theriaca, Turpentine. V. 

 White. Same as Hamburg White. 



Veniplex yen'-ip-leks) [vena, vein ; plexus, plexus]. 

 A venous plexus ; a plexus of veins. 



Venom {ven' -em) [zenenum, poison]. The poison 

 secreted by certain reptiles and insects, as the rattle- 

 snake, the scorpion, etc. V. -albumin, the albumin 

 of the venom of a snake. V. -globulin, a globulin 

 found in snake-poisons ; there are various kinds 

 described. V. -peptone, a peptone found in the 

 venom of certain serpents. V., Quickening, V., 

 Vital, semen. 



Venomous (rw/'-ow-w) [venenum, a poison]. Poison- 

 ous ; belonging or pertaining to venom ; secreting 

 venom. 



Venosal yen-o'-zal) [vena, vein]. Venous. 



Venose (ven'-oz) [vena, vein]. In biology, veiny; 

 furnished with conspicuous veins. V.-costate, in 

 biology, between ribbed and veined. 



Venosity (ven-os'-it-e\ [z^ena, vein]. Venous quality; 

 a condition in which the arterial blood shows venous 

 qualities ; general congestion of the veins. 



Venous (ve'-uus) [venosies]. Pertaining to a vein. 

 V. Hum, the murmur or rushing sound observed 

 in auscultation of a vein. V. Nevus. See Xtcvus 

 vascularis. 



Vent (vent) [ME., vente, vent]. An outlet, especially 

 the anal opening. 



Venter (ven' -ter) [venter, belly]. The belly or abdo- 

 men. Applied to structures having a concave or a belly- 

 like appearance. V. of Ilium, the iliac fossa. V. of 

 Kidney, the pelvis of the kidney. V. of Scapula, 

 the anterior surface of the scapula. 



Ventilation. The dilution and removal of all impuri- 

 ties that collect in the air of inhabited rooms, the 

 most common of which is C0 2 , which may be tested 

 by Lange's Method, q. v. In hospitals the fundamen- 

 tal principle of ventilation observed is that each adult 

 person confined in a space of iooo cubic feet requires 

 3000 cubic feet of fresh air per hour in order to pre- 

 vent the proportion of carbon dioxid in the room from 

 rising above 0.06 per cent. This estimate is based on 

 the fact that each adult expires, on the average, 0.6 of 

 a cubic foot of carbon dioxid per hour. Ventilation 

 may be natural, due to the forces constantly acting in 

 nature, or artificial, the result of measures intro- 

 duced by man. The former is brought about by the 

 agency of the wind and by diffusion, or the power 

 which gases of different densities possess of mixing 

 with each other. Artificial ventilation is brought 



