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GLOSSARY. 



Medulla Spina'lis (Lat.) The spinal 



marrow or cord. 

 Med'ullary (Lat. medulla, marrow). 



Relating to marrow ; in botany, 



belonging to or connected with 



pith. 

 Med'ullary Kays. In botany, masses 



of cells connecting the pith with 



the bark. 

 Med'ullary Sheath. The sheath 



which surrounds the pith in exo- 

 genous plants. 

 Mega- or Megal- (Gr. peyas, meg' as, 



large). A prefix in compound 



words, denoting large size. 

 Megac'eros (Gr. ^yas, meg' as, great ; 



Kepas, leer' as, horn.) The fossil or 



sub-fossil deer of the British Isles, 



commonly named the Irish elk. 

 Megalich/thys (Gr. ^705, meg' as, 



great ; \x6vs, ichthus, a fish). A 



large fossil fish. 

 Megalon'yx (Gr. ft-eyas, meg'as, 



great ; ovv, on'ux, a nail). An 



extinct animal allied to the sloth ; 



named from the large size of its 



claw-bones. 

 Megalosau'rus (Gr. ^6705, meg'as, 



great ; cravpos, satvros, a lizard). 



A large fossil land reptile. 

 Megathe'rioids (Gr. ^705, meg'as, 



great ; Orjptov, iherion, a wild 



beast ; flSos, eidos, form). A 



family of fossil mammalia allied to 



the megatherium. 

 Megathe'rium (Gr. fieyas, meg'as, 



great ; %>, ther, a beast). A large 



extinct animal, allied to the 



sloth. 

 Melae'na (Gr. neXas, mel'as, black). 



A discharge of dark blood from the 



bowels. 

 Melano'sis (Gr. jueiVos, mel'as, black). 



A diseased formation of a black or 



dark colour. 

 Melanot'ic (Gr. jueAos, mel'as, black). 



Having or of the nature of mela- 



nosis. 

 Melas'ma (Gr. /xeXoy, mel'as, black). 



A blackening or darkening. 

 Melliferous (Lat. mel, honey; fero, 



I bear). Producing honey. 

 Melliv'orous (Lat. mel, honey ; voro, 



I devour). Feeding on honey. 

 Mel'ody (Gr. jueAos, mel' os, a tune ; 



0*577, ode, an ode). An agreeable 

 succession of sounds. 



Membrana'ceous (Lat. membra'na, a 

 membrane). Consisting of mem- 

 brane. 



Membra'na Nic'titans (Lat.) The 

 winking membrane ; a moveable 

 fold of skin with which birds cover 

 their eyes. 



Membranous. See Membranaceous. 



Menin'ges (Gr. wviyt,, meninx, a 

 membrane). The membranes cover- 

 ing the brain and spinal cord. 



Meningi'tis ' (Meninges ; itis, deno- 

 ting inflammation). Inflammation 

 of the membranes covering the 

 brain. 



Menis'cus (Gr. ^VKTKOS, meniskos, 

 a crescent; from wvn, mene, the 

 moon). A lens convex on one side 

 and concave on the other, with a 

 sharp edge. 



Mensura'tion (Lat. mensu'ra, a mea- 

 sure). The art of measuring. 



Mentag'ra (Lat. mentum, the chin ; 

 Gr. aypa, agra, a seizing). An 

 eruptive disease affecting the chin 

 and upper lip. 



Mephit'ic (Lat. mephi'tis, an ill 

 smell). Offensive ; pestilential ; 

 destructive to life. 



Merca' tor's Chart (Gerrard Merca'tor, 

 a Flemish geographer). A repre- 

 sentation of the earth on a plane 

 surface. 



Mercu'rial (Lat. Mercu'rius, Mercury, 

 also quicksilver). Belonging to or 

 formed of mercury or quicksilver. 



Mer'icarp (Gr. /uepos, mer'os, a part ; 

 KapiTos, Jcarpos, fruit). The half of 

 the fruit of an umbelliferous plant. 



Merid ian (Lat. merid'ies, mid-day). 

 A great circle supposed to be drawn 

 through the poles of the eai'th at 

 right angles to the equator, dividing 

 the hemisphere into eastern and 

 western : when this circle arrives 

 opposite the sun, it is midday at 

 the place. Celestial meridian is 

 the vertical circle which passes 

 through the celestial pole. Mag- 

 netic meridian. See Magnetic. 



Merid' ional (Merid' ian). Belonging 

 to the meridian. 



Merismat'ic (Gr. pspifa meri'zo, I 



