

LACTOSERUM 



653 



amniotic liquor of cows, and in certain pathologic 

 secretions. It crystallizes in white, hard, rhombic 

 prisms, containing one molecule of water. It is soluble 

 in water, has a faint sweet taste, and is insoluble in 

 alcohol. Its aqueous solution is dextro-rotatory. It 

 melts at 205 C. It is much used in pharmacy for 

 making triturations, and is the vehicle of most homeo- 

 pathic preparations. See Carbohydrates, Table of 



Lactoserum (lak-to-se'-rum) [lac, milk ; serum, whey]. 

 The serum or whey of milk. 



Lactosuria (lak-to-su' -re-ah) \Jac, milk ; ovpov, urine]. 

 The presence of lactose in the urine ; a condition oc- 

 casionally seen in pregnancy. 



Lactotoxin (lak-to-toks' '-in) [jac, milk; to^ikov, poison]. 

 A poisonous substance found in milk. 



Lactous (lak'-tus) [lactosus, milky]. Milky. 



Lactuca (lak-tu' -kah) [L. , " lettuce "]. A genus of 

 composite-flowered herbs ; the lettuces. L. altissi- 

 ma, L. elongata, L. montana, L. sativa (com- 

 mon garden lettuce), and L. virosa, afford lactuca- 

 rium ; but the L. virosa is the source recognized in 

 the U. S. Pharmacopeia. Lactuca (B. P.) is also a 

 synonym of Lactucarium, q. v. 



Lactucarium (lak-tu-ka' -re-um) [L.:gen., Lactucarii\ 

 Lettuce. The milky juice of Lactuca virosa, a bien- 

 nial plant. It contains a crystalline substance, lactu- 

 cerin, to which its properties are thought to be due. 

 It is a mild hypnotic, with sedative and diuretic prop- 

 erties, somewhat similar to opium, but without depres- 

 sant after-effects. It is frequently an ingredient of 

 patented cough-mixtures ; varieties of commercial lac- 

 tucarium are produced by other species of Lactuca, q. 

 v. L., Ext. (B. P.) Dose gr. v-xv. L., Ext., 

 Fid. Dose tn^x-^j. L., Syr., contains 5 per cent, 

 ofthedrug. Dose 3J-^j. L., Tinct., dose 3 ss— Jij. 



Lactucerin {lak-tu' -ser-in) [lactuca, lettuce ; cera, 

 wax]. A crystalline substance existing in lactu- 

 carium, q. v. 



Lactucerol (lak-tu' -ser-ol) [lactuca, lettuce ; oleum, 

 oil], CjflHggOj. A crystalline substance existing in 

 lactucerin; it occurs in two isomeric forms. 



Lactucic Acid (lak-tu' -sik) [lactuca, lettuce] , C^Hg^Og. 

 A yellow, amorphous body found in lactucarium. It 

 is insoluble in chloroform, ether, benzin, and carbon 

 bisulphid. In some respects it resembles oxalic acid. 

 See Acid. 



Lactucin (lak-tu' -sin) [lactuca, lettuce]. A crystalline 

 extractive of lettuce and of lactucarium. 



Lactucol (lak'-tu-kol) [lactuca, lettuce], C 13 H 20 O. A 

 substance crystallizing in needles, formed when lac- 

 tucerin and potassium hydrate are melted together. 



Lactu con (lak-tu' -kon). Same as Lactucin. 



Lactucopicric Acid, Lactucopicrin (lak-tu-ko-pi¥- 

 rik, lak-tu- ko-pik' -rin) [lactuca, lettuce ; Tviupdg, 

 bitter], C^H^O.,,. An amorphous, bitter principle 

 contained in lactucarium. 



Lactumen (lak-tu' -men) [lac, milk : //. , Lactumina~\. 

 A synonym of Porrigo larvalis. Also, applied to 

 that form of aphthae in which the spots have a fanci- 

 ful resemblance to clots of curd. 



Lactupicrin (lak-tu-pik'-rin). See Lactucopicric Acid. 



Lacuna (la-ku'-nah) [lacus, a lake: //., Lacunce\ 

 A little hollow space. A mucous or lymphatic folli- 

 cle. L., Absorption. See Howship's Lacuna. L. 

 amatorum, the vertical groove in the center of the 

 upper lip. L. Bone. See Bone. L. of Cemen- 

 tum, spaces in the cement of the teeth analogous to 

 those in bone. L. cerebri, the infundibulum of the 

 brain. L. of Cornea, spaces between the laminae of 

 the cornea. L. graafianae, Graafian follicles. L., 

 Haversian. See Bone. L., Howship's. I. De- 

 pressions on the surface of bone beneath the perios- 



L^ESIS 



teum. 2. Carious excavations in bone filled with 

 granulation-tissue. L., Intervillous (of placenta), 

 the spaces in the maternal portion of the placenta 

 filled with blood, and in which the fetal villi hang. 

 L. labii superioris. See L. amatorum. L. later- 

 ales sinus superioris, depressions along the groove 

 of the superior longitudinal sinus. L. magna, the 

 largest of the orifices of the glands of Littre, situated 

 on the upper surface of the fossa navicularis. L. 

 morgagni, the orifices of the glands of Littre, or the 

 glands themselves. L. pharyngis, a depression at 

 the opening of the Eustachian tube into the pharynx. 

 L. of Tongue, the foramen cecum. See Foramina , 

 Table of. L. of Urethra, follicular depressions in 

 the mucous membrane of the urethra, most abundant 

 along the floor, especially in the region of the bulb. 

 Their mouths are directed forward. 



Lacunal (la-ku'-nal), or Lacunar (la-ku'-nar) [lacus, 

 lake]. Pertaining to the lacunae. L. Spaces, the 

 irregular fissures between the fasciculi of connective 

 tissue, forming the beginnings of the lymphatic vessels. 



Lacunose (la-ku'-nos) [lacuna, a pit, a hollow]. In 

 biology, having pits, depressions, or spaces. 



Lacunosorugose (la-ku' -no-so-ru' -gos) [lacuna, pit, 

 hollow; ruga, a wrinkle]. In biology, deeply pitted 

 or wrinkled, as the stone of a peach. 



Lacunula (lak-u' -nu-lah) [dim. of lacuna, a lake : //., 

 Lacunulce~\. A small or minute lacuna; an air- 

 space, such as is seen in a gray hair when magnified. 



Lacus (la'-kus) [L.]. A small hollow or cavity in a 

 tissue. L. derivationis, one of the venous spaces 

 in the tentorium cerebelli communicating with the 

 superior longitudinal and lateral sinuses. L. lacry- 

 malis, the space at the inner canthus of the eye, near 

 the punctum, in which the tears collect. L. sangui- 

 neus, the utero-placental sinus. 



Lacustrine (la-kus'-trin) [lacus, a lake]. In biology, 

 inhabiting lakes or ponds. 



La Dando (lah dan' -do). Synonym of Influenza. 



Ladanum {lad'-an-//m)[h. ; Gr., ?.r/davov~\. The con- 

 crete gummy and resinous juice of various species of 

 Cistus, growing in the Mediterranean region ; as C. 

 ladaniferus , C. creticus, C. salvifolius, C. cyprius, C. 

 ledon, and C. villosus. It is a greenish-gray solid, of 

 bitter taste, formerly in high esteem. It is now 

 chiefly used in making pastils for fumigation. 



Ladendo (lad-en' -do). Synonym of Influenza. 



Ladrerie (lah-dra-re') [Fr. ]. See Measles. 



Ladric (lah'-drik). Pertaining to measles. 



Lady Crespigny's Pill. A pill of aloes and cinchona ; 

 aloes socotr. 5jj, ext. cinchona 3iij, cinnam. 3J, syr. 

 absinth, q. s. It is a stomachic and laxative. Dose 

 gr. x-xx. 



Lady Hesketh's Pill. A pill similar to Lady Cres- 

 pigny's Bill, q.v. 



Lady Webster Pill. See Aloe. 



Lady's Bed-straw. Cheese-rennet. The herb Gal- 

 ium verum, a refrigerant and diuretic. Dose, fld. ext. 

 £ss-j. Unof. L.'s Slipper. See Cypripedium. 



Lsemoparalysis (le-mo-par-al' -is-is). See Lemoparal- 

 ysis. 



Laennec's Cirrhosis. Atrophic cirrhosis of the liver; 

 a form of chronic interstitial hepatitis of the liver in 

 which the organ is greatly reduced in size and may be 

 deformed. The weight may be reduced to a pound 

 or a pound and a half; the surface of the organ is 

 granular ; and its substance is composed of greenish - 

 yellow islands surrounded by grayish- white connective 

 tissue. L.'s Perles and L.'s Rale. See Signs and 

 Symptoms, Table of. L. tubercles, the miliary granu- 

 lations of tuberculosis. 



Laesis (le'-sis). See Lesion. 



