GLOSSARY. 



117 



science in general, or to any branch 

 of science. 



Nom'inative (Lat. nomen, a name). 

 Naming ; applied to the first case 

 of nouns, which denotes the name 

 of the person or thing. 



Non-conductor. A substance which 

 does not conduct heat, electricity, 

 &c. 



Normal (Lat. norma, a rule). Ac- 

 cording to rule ; regular : a per- 

 pendicular, especially to a curve at 

 a given point. 



Nosog'raphy (Gr. vocros, nos'os, dis- 

 ease ; ypa(p(*>, graph' o, I write). A 

 description of diseases. 



Nosolog'ical (Gr. vooos, nos'os, dis- 

 ease; Ao-yo?, logos, discourse). Re- 

 lating to a classification of diseases. 



Nosol'ogy (Gr. vovos, nos'os, dis- 

 ease ; \oyos, logos, discourse). The 

 branch of medical science which 

 distributes diseases into classes, 

 orders, genera, and species, and 

 distinguishes diseases by their pro- 

 per names. 



Nostal'gia (Gr. VOVTOS, nostos, re- 

 turn ; a\yos, algos, pain). Home- 

 sickness ; a desire to return to one's 

 country, amounting to disease. 



Notal (Gr. VWTOS, nutos, the back). 

 Belonging to the back. 



Nota'tion (Lat. noto, I mark). The 

 marking or reading anything by 

 figures or other chai'acters. 



No'tochord (Gr. VOOTOS, ndtos, the 

 back ; xp5a, chorda, a cord). 

 The nbro-cellular gelatinous column 

 which forms the primary condition 

 of the spine in vertebrate animals. 



Notorhi'zal (Gr. V<DTOS, notos, the 

 back ; pifo rhiza, a root). Having 

 the radicle in the embryonic plant 

 on the back of the cotyledons. 



Nubec'ula (Lat. a little cloud). In 

 astronomy, a name given to the 

 Magellanic clouds, or two extensive 

 nebulous patches of stars. 



Nu'chal (Lat. nucha, the back of the 

 neck). Belonging to the neck. 



Nu'clear (Lat. nu'cleus,) Formed of 

 nuclei. 



Nu'cleated (Lat. nu'cleus, a kernel). 

 Having a nucleus, or central par- 

 ticle. 



Nu'cleolus (Nu'cleus}. A little nu- 

 cleus ; a small body sometimes ob- 

 served within the nucleus of an 

 animal or vegetable cell. 



Nu'cleus (Lat. a kernel). A body 

 about which matter is collected ; a 

 small compact body found in ani- 

 mal and vegetable cells ; in as- 

 tronomy, the bright central spot 

 sometimes seen in the nebulous or 

 misty matter forming the head of 

 a comet. 



Nudibra'cbiate (Lat. nudus^ caked ; 

 bra'chium, an arm). Having 

 naked arms ; applied to polypi, the 

 tentacles of which are not covered 

 with cilia. 



Nudibran'chiate (Lat. nudus, naked ; 

 Gr. &payx ta i bran'chia, gills). 

 Having exposed gills ; applied to 

 an order of gasteropodous mollusca 

 which have no shell, and have the 

 gills exposed. 



Numeration (Lat. nu'merus, a num- 

 ber). The art of reading or writing 

 numbers. 



Nu'merator (Lat. nu'merus, a num- 

 ber). The number iu fractions 

 which shows how many of the parts 

 are to be taken. 



Numerical Method. The branch of 

 science which treats of the right 

 manner of deriving conclusions from 

 the collected numerical statement 

 of the results of certain forces or 

 causes. 



Numismatic (Lat. numis'ma ; from 

 Gr. vofji.ia-fj.a, nomis'ma, money). 

 Relating to coins or money. 



Numismatol'ogy (Lat. numis'ma ; 

 Gr. \oyos, logos, discourse). The 

 science of describing coins and 

 medals. 



Num'mulated (Lat. nummus, money). 

 Having some resemblance to a coin. 



Num'mulite (Lat. nummus, money ; 

 \iOos, lith'os, a stone). A fossil 

 shell resembling a coin, found in 

 the limestone in the tertiaiy strata. 



Nuta'tion (Lat. nuto, I nod). In 

 astronomy, the alternate approach 

 and departure of the pole of the 

 equator to and from the pole of the 

 ecliptic, combined with the alter- 

 nate increase and decrease of its 



