DERENCEPHALOUS 363 



brain through a split in one or more of the cervical 

 vertebra. 



erencephalous (der-en-sef f -al-us) [Seprj, neck; kyui- 

 oaAof, brain]. Affected with derencephalia ; of the 

 nature of derencephalus. 



erencephalus (der-en-sef'-al-us) [Sept], neck; tyni- 

 oa/oc, brain]. A variety of single autositic monsters 

 of the species anencephalus, in which the bones of the 

 cranial vault are rudimentary, the posterior portion of 

 the occiput absent, and the upper cervical vertebrae 

 bifid, the brain resting in them. 



eRheim's Plaster. A celebrated plaster for chilblains, 

 made as follows: Capsicum pods 3J, strong alcohol, 

 3jij; macerate several days, then add mucilage of 

 acacia §ij. Stir well and brush over sheets of silk 

 or tissue paper, and apply like court-plaster to the 

 unbroken chilblain. 



irivant ider'-iz'-ant) [derivare, to derive]. I. Deriv- 

 ative ; revulsive. 2. A derivative medicine or appli- 

 cation. 



irivate (der'-iv-at) [derivare, to derive] . In chemistry, 

 a substance that is derived from another, 

 irivation (der-iv-a' 'shun) [derivare, to derive]. I. 

 Derivative action ; the drawing away of a morbid 

 process from one part to another ; revulsive treatment. 

 2. The supposed suctional power of the heart, or the 

 itfect of that power upon the circulation. D. Wire, 

 n an electric battery a wire connecting two points in 

 1 closed circuit. 



-jrivative (de-rh'-at-iv) [derivare, to turn aside a 

 ;tream]. Diverting or drawing a morbid process from 

 ts seat; revulsive. 



rm. See Derma. 



;rma ler'-mah) [Sepua, the skin]. The skin. The 

 Urue skin. See Cutis. 



^rmad {der'-mad') [Sepua, the skin; ad, to]. Ex- 

 ternally ; toward the skin ; ectad. 

 -irmagra [der-ma' '-grah) . See Dermatagra. 

 l:rmal Jer'-mal) [Sepfia, the skin] . Pertaining to the 

 7 kin. 



Lrmalaxia (der-mal-aks' -e-aK) [Sepua, skin ; ua/.ai-ia, 

 -oftness]. Morbid softening of the skin. 

 l:rmalgia (der-ma? -je-ah). See Dermatalgia. 

 Irmanoplasty (der-mat? -o-plas-te) [Sepua, skin ; 



varr/Acaeiv, to form anew]. Skin-transplantation ; 



kin-grafting; a method of plastic surgery, in which 

 i piece of the whole thickness of the skin is entirely 



emoved from one part and transferred to another 



istant part to fill up a gap. 

 I rmanyssus (der-mau-is'-us) [Sepua, skin ; viaaeiv, 



) prick]. A genus of itch-mites. D. avium is a 



pecies found on birds and sometimes on the human 



abject. 

 I rmapostasis {der-map-os' -tas-is) [Sepua, skin ; airoc- 



affic, a falling away]. Any skin-disease dependent 



pon some constitutional disorder, and marked by 



letastatic dermal deposits. 

 I nnatagra (der-mat-a' -grah) [Sepua, skin ; aypa, 



nzure]. See Pellagra. 

 Irmatalgia i Jer-mat-al' '-je-ah) [Sepua, skin; a/.yoc, 



ain]. Neuralgia of the skin. Rheumatism of the 



an. Pain in the skin not due to any structural change 



I- matauxe (der-mat-awks f -e) [Sepua, skin; avgq, 

 ration]. Thickening or hypertrophy of the 



I- matic [der-ma? -ik) [SepuariKor, pertaining to the 



in]. 1. Relating to the skin. 2. A remedy for 



diseases of the. skin. 



t matitis (der-ma/-? -(is) [Skpua, skin ; trig, inflam- 



ation]. A generic term used to designate an ill-de- 



ied and extensive group of symptomatic inrlamma- 



DERMATITIS 



tions of the skin, characterized clinically by redness, 

 heat, swelling, and pain, and terminating in resolution, 

 suppuration, gangrene, or chronic dermatitis. D. am- 

 bustionis, the form due to bums and scalds. D." bul- 

 losa. See Epidermolysis. D. calorica. Synonym 

 of Chilblain. D. congelationis. Same as Frost- 

 bite. D. contusiformis. See Erythema nodosum. 

 D. exfoliativa, an acute or chronic, general or partial, 

 inflammation of the skin, in which the epidermis is 

 shed more or less freely in large or small scales. See 

 Pityriasis rubra. D. exfoliativa infantum vel neo- 

 natorum, Ritters Disease ; a severe form of exfolia- 

 tive inflammation of the skin, usually unattended by 

 fever, which begins between the second and fifth 

 weeks of life. About 50 per cent, of those attacked 

 succumb to marasmus. D. gangraenosa ; Sphacelo- 

 derma ; gangrenous inflammation of the skin. It 

 has been observed in cases of cerebral and spinal dis- 

 orders, diabetes, etc. It may also be primary in those 

 whose constitutions are depraved. The lesions are at 

 first reddish or purplish erythematous spots, usually 

 on the trunk and extremities ; these vesicate, rapidly 

 become gangrenous, and slough ; they are attended 

 by fever and constitutional disturbance. Spontaneous 

 recovery generally ensues with scar-formation. D. 

 gangraenosa infantum ; Varicella gangrenosa, pem- 

 phigus gangrcenosus ; rupia escharotica ; a gangrenous 

 eruption following varicella and other pustular erup- 

 tions of children. It is a rare condition. If it occur 

 while the varicellar lesions are still present, it begins 

 on the head or upper part of the body, and, instead of 

 the scab being thrown off, ulceration occurs beneath it, 

 and often a pustular border with a red areola is formed, 

 the whole resembling a vaccination-pustule. On sep- 

 arating, a sharp-edged, roundish or oval, conical ulcer 

 remains, deep or shallow. Death may result if the 

 lesions are numerous, and constitutional disturbance is 

 always great. D. herpetiformis, an inflammatory 

 skin-disease of an herpetic character, the various le- 

 sions showing a tendency to group. It is a protean 

 disease, appearing as erythema, vesicles, blebs, and 

 pustules. Itching and burning are the most marked 

 symptoms. See Hydroa herpetiforme . D., Malig- 

 nant, Papillary dermatitis, Paget' s disease of the nip- 

 ple. Carcinoma of the nipple. D. medicamentosa, 

 Drug-eruptions ; inflammatory eruptions upon the skin 

 due to the action of certain drugs taken internally. 

 The most prominent are the following: Antifebrin 

 produces a kind of cyanosis; antipyrin, an erythema 

 that may be general or partial, but symmetric, af- 

 fecting the extensor aspects in preference to the flexor, 

 and the limbs more than the trunk ;- papules, vesicles, 

 and bullae have been noted ; arsenic produces an urti- 

 carial, erysipelatoid dermatitis of the face and eyelids, 

 a papular rash on the face, neck, and hands, herpes 

 zoster, and in large doses pustular, ulcerative, or gan- 

 grenous eruptions ; belladonna, a diffuse erythema- 

 tous blush and a scarlatiniform eruption ; boric acid, 

 an erythema ; borax, psoriasis, eczema, and erythema ; 

 bromin and bromids, pustular, erythematous, urticarial, 

 bullous, and squamous eruptions ; cannabis indica, a 

 vesicular eruption ; chlorate of potash, a fiery, erythema- 

 tous and papular eruption, and cyanosis ; chloroform, 

 purpuric spots; chloral hydrate, erythema, scarlatini- 

 form, bullous, erysipelatous eruptions ; chloralamid, 

 scarlatiniform ; chrysarobin, erythema, vesicles ; cod- 

 liver-oil, vesicular eruption, acne ; copaiba, erythema- 

 tous, urticarial, papular eruption ; cubebs, papular ery- 

 thema; digitalis, scarlatiniform, papular erythema; 

 iodin and iodids, pustular, vesicular or bullous, purpuric, 

 erythematous, urticarial ; iodoform, punctiform, papular 

 and erythematous ; mercury, erythematous, exfoliative 



