306 VOCABULARY. 



Lachrymal, appertaining to or relating to the tears, or to the apparatus 

 for their production. 



Lacteals, capillary or hair-like vessels opening upon the internal sur- 

 face of the intestines, absorbing the chyle or nutritious fluid pre- 

 pared by the digestive organs from the food, and conveying it through 

 the mesentery to the thoracic duct and thence into the circulating 

 mass of the blood. 



Lamella, a thin plate or edge. 



Laminae, thin plates or layers. 



Larynx, the upper part of the windpipe,'including the organs of voice. 



Lens, a circular glass whose surfaces are either convex or concave. 

 It is also applied to any other transparent body of the same shape, as 

 ice, crystal, or diamond. 



Levitation, the making an object lighter ; giving to it a buoyant ten- 

 denc5\ 



Longus, long. A name applied to several muscles of the body on ac- 

 count of their length when compared with other muscles. 



Lubricity, facility of the slipping or gliding of one surface over an- 

 other without friction, whether in consequence of the smoothness 

 of the surfaces, or the interposition of some soft, slippery fluid or 

 substance. 



Lubricate, to give lubricity. 



Luxation, dislocation of a bone, throwing a bone out of joint. 



Lymphatics, small vessels in the bodies of animals carrying lymph. 



M. 



Masscter, a strong muscle which closes the jaw in chewing, situated 



at the back part of the cheek towards the ear. It may be felt in 



chewing. 

 Mediastinum, a fold of the membrane lining the chest, by which it 



is divided into two cavities. 

 Medullary, formed or consisting of marrow. Applied to the substance 



of the brain and nerves, and to that in the cavities of some of tlie bones. 

 Menstruum, any liquid or fluid in which another bodj' is dissolved. 

 Mesentery, a double fold of the membrane lining the abdomen and 



covering the intestines, by which the latter are suspended, and are 



connected to the walls of the cavity. It gives passage to vessels, 



nerves, and to the lacteals. 

 Monopetalous, applied to flowers consisting of a single petal or flower 



cup. 



N. 

 JVectaria, that part of the corolla of plants which produces honey. 

 JVictitating, winking. Applied generally to the third eyehd of birds 



and some other animals. 

 JVigella, the name of a plant. 

 JVymphae, insects in the second preparatory state, before their final 



transformation. 



O. 



Oblate. A sphere flattened at the poles is said to be oblate. 

 Oesophagus, the tube or canal which conveys food from the mouth 



to the stomach. 

 Omentum, the caul ; a kind of apron formed of fat and membrane 



which hangs down and covers the intestines within the abdomen. 



