LEYDEN'S CRYSTALS 



676 



LICHENIASIS 



Periodic Vomit of. Synonym of Angioneurotic 

 Edema. 



Leyden's Crystals. See Charcot- Leyden Crystals. 



Leydig's Cells. Peculiar goblet-cells found in the epi- 

 dermis of aquatic vertebrata. L., Duct of. See Duct. 



Liatris {li-a f -tris) [origin unknown]. A genus of com- 

 posite-flowered herbs. L. cylindrica, L. elegans, and 

 L. spicata are diuretic ; L. scariosa and L. squar- 

 rosa are popularly esteemed as remedies for rattlesnake- 

 bite. L. odoratissima, southern vanilla, contains 

 cumarin, the flavoring principle of the tonka bean. 

 Unof. 



Libanotus (lib-an-o' '-tus) ["ki&avuTdc, from Aij3avog, 

 frankincense]. An old name for olibanum. 



Libanus {lib'-an-us) [Mfiavog, frankincense]. Frankin- 

 cense, or olibanum. 



Libavius, Fuming Liquor of. An old name for anhy- 

 drous stannic chlorid. 



Liber (le'-ber) [L.]. A book. L. pharmaceuticus, 

 a dispensatory. 



Liber (li'-ber) \fiber, the inner bark of a tree]. The 

 inner layer of the bark in Gymnosperms and Dico- 

 tyledons. 



Liberation (lib-er-a' -tion) \liberare, to make free]. 

 The act of freeing. L. of the Arms, in breech- 

 presentations, the bringing down of the arms of the 

 fetus when they have become extended along the 

 sides of the child's head. 



Liberomotor {lib-er-o-mo' -tor) \liberare, to disengage ; 

 motor, mover]. Setting free or disengaging motor 

 energy. 



Libidinous [lib-id' '-in-us) \libidinosus, lustful]. Char- 

 acterized by strong sexual desire. 



Libido {lib-id'-o) [L.]. Desire; lust. L. intestini, 

 desire for defecation. L. sexualis, lust. L. urinae, 

 desire to urinate. 



Liborius, Bacillus of. See Bacteria, Synonymatic 

 Table of. 



Libra (le'-brah) [libra, a balance]. A weight of 

 twelve troy ounces, or 5760 grains. Also, applied to the 

 avoirdupois pound of sixteen ounces, or 7000 grains. 



Libriform {lib'-riform) \liber, inner bark ; forma, 

 form]. In biology, resembling liber or bast. L. 

 Cells, those cells of the wood that are excessively 

 thick-walled and resemble bast or liber-fibers. 



Lice {lis). See Louse. 



License {li'-sens) \licentia, license]. An official per- 

 mit or authority conferring on the recipient the right 

 and privilege of exercising his profession. 



Licentiate {li-sen' -she-dt) \ficentiatus, one licensed]. 

 A term sometimes applied to a person who practises a 

 profession by the authority of a license. 



Lichen {li'-ken) \aeixt]v, sl lichen]. A generic term 

 for a well-defined group of inflammatory affections of 

 the skin, in which the lesions consist of solid papules 

 throughout the entire course of the disease. L. 

 acuminatus, a variety of L. ruber in which the 

 papules are acuminate. It is usually a very acute 

 variety, accompanied by grave constitutional symptoms 

 (rigors, pyrexia, sweats, prostration), and by itching. 

 The papules are minute, firm, conic, capped with 

 scales, very closely aggregated, but can generally be 

 recognized as surrounding the hair-follicles. L. 

 agrius. See Eczema papulosum. L. annulatus 

 serpiginosus. See Seborrhea corporis. L. Carrageen, 

 Irish moss. L. circinatus serpiginosus. See Se- 

 borrhcea corporis. L. circumscriptus. Same as Z. 

 circinatus serpiginosus. See also Eczema papillosum. 

 L. confertus, a form characterized by the presence of 

 superficial papules occurring in clusters. L. corneus, 

 a form in which there are elevated horny patches. 

 L. diabeticorum. See Xanthoma diabeticorum. 



L. disseminatus, a variety in which the lesions are 

 irregularly scattered over the body. L. ferox or L. 

 ferus. See L. agrius. L. gyratus. See Seborrhea cor- 

 poris. L. haemorrhagicus, a petechial papular erup- 

 tion. L. inveterata, a chronic intractable form, with 

 marked thickening of the skin. L. lividus, a severe 

 form of purpura in which hemorrhage occurs into the 

 lesions around the follicles. L. menti. See Sycosis. 

 L. obtusus, Lichen ruber obtusus ; a variety of L. 

 planus in which the lesion consists of medium-sized 

 papules, hemispherically formed, flattened on the top, 

 and marked in the center by a fine indentation, 

 hard, dry, smooth, wax-like, translucent to brownish- 

 red, and scaleless. The disease is less acute than L. 

 acuminatus , itches less, and is mostly circumscribed. 

 The hair and nails never suffer. L. pilaris, Lichen 

 spinulosus ; Lichen spinostis ; an inflammatory disease 

 of the hair-follicles, in which a spinous epidermic peg 

 occupies the center of the papule. It is a rather rare 

 disease and occurs mostly in children. The papules 

 appear in crops, each one being the size of a pin's 

 head, red, conic, and containing in its center a horny 

 spine that projects about one-sixteenth of an inch. 

 There is little or no itching. See also Keratosis 

 pilaris. L. planus, Lichen ruber planus ; Lichen 

 psoriasis; an inflammatory skin-disease, with an erup- 

 tion made up of papules that are broad and angular at 

 the base, flat and apparently glazed on the summit, 

 slightly umbilicated, and of a dull purplish-red color. 

 These lesions are usually symmetrically disposed, and are 

 generally situated on the flexor surfaces of the forearms, 

 about the wrists, the flanks, around the waist, and the 

 knees, and calves, and also on the mucous membranes. 

 The papules may be discrete or may coalesce, and itch- 

 ing may be slight or severe. L. planus verrucosus, a 

 late stage of L. planus, characterized by wart-like en- 

 largements of the papillje, which are covered with dense 

 horny crusts of a dirty-lilac hue. They are usually seen 

 on the lower part of the leg. L. psoriasis. See L. 

 planus. L. ruber, Lichen ruber acuminatus ; a 

 very rare skin-disease, with lesions consisting, in the 

 beginning, of discrete, miliary, conic papules, but, as 

 the disease advances, becoming aggregated and form- 

 ing continuous red, infiltrated, and scaling patches. 

 The whole surface may eventually become involved. 

 The nails of the fingers and toes become affected, be 

 ing of a dirty-brown color, rough, flaky, and breaking 

 off short. The etiology and pathology of thi> 

 condition are obscure. L. ruber acuminatus. 

 See Pityriasis rubra pilai-is and Liche>i ruber. L. 

 ruber moniliformis, a rare variety in which, l> 

 the ordinary papules and plaques, there are 

 moniliform bands in the flexures of the limbs, on the 

 abdomen, and on the neck. L. ruber obtusus. S 

 obtusus. L. ruber planus. See L. planus. L. scrof- 

 ulosorum. See L. scrofulosus. L. scrofulosus, 

 L. scrofulosorum ; a form occurring in strumous chil 

 dren. The eruption is situated on the trunk, espi 

 upon the back, either diffusely or in patches. 1 he 

 papules are very small, pale, conic, and surmounted 

 by fine scales ; they cause no itching, and on 

 leave a rather persistent yellowish pigmentation 

 L. simplex, Gale bedouine ; the papular stag! 

 eczema. See Eczema papulosum . L. spinosus. ^ 

 Z. pilaris. L. spinulosus. See Keratosis pilaris 

 Lichen pilaris. L. strophulosus. See v 

 L. syphiliticus, the minute papular sypbflj 

 See Syphilid, Follicular. L. tropicus. Sec Pti 

 J/eat. L. urticatus. See Urticaria paPulow 

 Licheniasis {li-ken-i'-as-is) [Anyr/v, lichen]. 



condition of one affected by one of the forms of lichen. 

 L. strophulus. See Lichen strophulus. 



