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GLOSSARY. 



Myr'iagramme (Gr. pvpioi, mu'rioi, 

 ten thousand ; Fr. gramme}. A 

 French weight of ten thousand 

 grammes, or about twenty-two 

 pounds avoirdupois. 



Myr'iametre (Gr. fj.vpioi, mu'rioi, ten 

 thousand ; Fr. metre). A French 



measure of ten thousand metres, or 

 6-21 English miles. 

 Myr'iapods (Gr. fj.upioi, mu'rioi, ten 

 thousand ; irovs, pous, a foot). A 

 class of invertebrate animals, gener- 

 ally resembling insects, but with 

 numerous legs ; as the centipede. 



N. 



Na'creous (Fr. nacre, mother-of- 

 pearl). Having a pearly lustre. 



Nadir (Arabic natara, to be like, or 

 correspond). The point in the 

 heavens of the opposite or invisible 

 hemisphere, which would be reached 

 by a perpendicular line drawn from 

 an observer on the surface of the 

 earth, and reaching at the other 

 end a point in the visible hemi- 

 sphere, called the zenith. 



NaBvus (Lat.). A tumour consisting 

 essentially in an excessive growth 

 of the vascular tissue of a part. 



Na'piform (Lat. napus, a turnip ; 

 forma, shape). Shaped like a 

 turnip. 



Narcotic (Grr. vapKoco. nar'koo, I 

 render torpid). Producing insen- 

 sibility to pain and external im- 

 pressions, with sleep. 



Narcotism (Grr. vapKow, nar'koo, I 

 render torpid). The effect of a 

 narcotic medicine or poison. 



Na'res (Lat. naris, a nostril). The 

 nostrils. 



Na'sai (Lat. nasus, the nose). Belong- 

 ing to the nose ; formed by the nose. 



Nascent (Lat. nascor, I am born). 

 Beginning to exist : the nascent 

 state of a gas is the condition in 

 which it is at the moment when it 

 is liberated from combination. 



Nata'tion (Lat. nato, I swim). The 

 act of swimming. 



Natato'res (Lat. nato, I swim). 

 Swimmers ; an order of birds with 

 feet provided with webs for swim- 

 ming, as ducks, geese, swans, and 

 gulls. 



Na'tatory (Lat. nato, I swim). 

 Enabling or assisting to swim ; 

 formed for swimming, 



Nat'ural History. The science which 

 describes the natural products of 

 the earth, animal, vegetable, and 

 mineral; their characters, relations, 

 arrangement, &c. 



Nat'ural Philos'ophy. The science 

 which describes the material world, 

 the bodies which compose it, and 

 their qualities and properties. 



Nat'ural Sys'tem. The classification 

 of animals or plants into orders, 

 genera, and species, according to 

 their alliances in points of struc- 

 ture which are regarded as essen- 

 tial. 



Nau'sea (Gr. vavs, naus, a ship). A 

 disgust for food, with inclination to 

 vomit ; probably at first applied to 

 sea-sickness. 



Nau'tical (Gr. vavr-rjs, nautcs, a 

 sailor). Pertaining to seamen or 

 navigation. 



Nau'tilites (Lat. nau'tilus). Fossil 

 shells apparently allied to the 

 nautilus. 



Navic'ular (Lat. navic'ula, a boat ; 

 from navis, a ship). Belonging to 

 or like a boat ; applied to one of 

 the bones of the wrist, from its 

 shape. 



Neb'ula (Lat., a mist). A little cloud 

 or mist : in astronomy, an object, 

 resembling stars seen through a 

 mist, or a cloudy speck, but found 

 by the telescope to consist of a 

 cluster of stars. 



Neb'ular (Lat. neb'tda, a mist). Re- 

 lating to nebulas ; the nebular 

 hypothesis was a belief that the 

 appearances called nebulae were the 

 results of the aggregation of a sort 

 of luminous fluid diffused thi'ough 

 different parts of the universe. 



