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GLOSSARY. 



retrogressive motion ; in botany, 

 applied to a property which some 

 flowers have of following the appa- 

 rent motion of the sun. 



Nu'trient (Lat. nu'trio, I nourish). 

 Nom-ishing. 



Nu'triment (Lat. nu'trio, I nourish). 

 Food ; the material supplied for 

 repairing the waste or promoting 

 the growth of living bodies. 



Nutrition (Lat. nu'trio, I nourish). 

 The process by which animals or 

 vegetables appropriate to their 

 repair or growth material taken 

 from external organic substances. 



Nyctalo'pia (Gr. i/u|, nux, the night ; 

 a\ao(j.ai, ala'omai, I grope about ; 

 fcnj/, dps, the eye). A defect of 

 vision, in which the patient can. see 

 by day, but not by night. 



0, 



Ob (Lat.) A preposition in compound 

 words, signifying against, reversed, 

 or contrary. 



Obcompress'ed (Lat. ob ; comprimo, 

 I press together). Flattened in 

 front and behind. 



Obcor'date (Lat. ob, against ; cor, the 

 heart). Like a heart reversed ; 

 applied in botany to leaves shaped 

 like a heart, with the apex next 

 the stem. 



Ob'elisk (Gr. ofcAos, ob'elos. a spit). 

 A four-sided column, of one stone, 

 rising in the form of a pyramid, 

 and having a smaller pyramid at 

 the top. 



Obe'sity (Lat. obe'sus, fat), An ex- 

 cessive fatness. 



Ob'ject (Lat. ob, against ; jacfio, I 

 throw). That which is acted on 

 by the senses, the mental faculties, 

 or other agents. 



Object-glass. The lens in a telescope 

 or microscope which first receives 

 the rays of light coming from an 

 object and collects them to a focus 

 or central point, where they form 

 an image which is viewed through 

 the eye-piece. 



Objec'tive (Lat. ob, against ; jac'io, 

 I throw). Belonging to an object ; 

 in medicine, applied to symptoms 

 observed by the physician ; in 

 grammar, denoting the case which 

 is acted on. 



Obla'te (Lat. ob, against; latus, 

 borne or carried). Flattened at the 

 poles ; applied to spherical bodies 

 flattened at the poles or ends, like 

 an orange. 



Obli'que (Lat. obli'quus, sideways) 

 Neither perpendicular nor paral- 

 lel. 



Ob'olite Grit. In geology, the lower 

 Silurian sandstones of Sweden and 

 Russia, from the abundance of 

 shells of the obolus, a brachiopod 

 mollusk. 



Obo'vate (Lat. ob ; ovate). Reversely 

 ovate, the broad end of the egg 

 being uppermost. 



Observa'tion (Lat. obser'vo, I observe). 

 The art of observing ; one of the 

 processes by which natural pheno- 

 mena are to be investigated. 



Obser'vatory (Lat. obser'vo, I observe). 

 A place or building constructed for 

 astronomical observations. 



Obsidian (Lat. obsidia'num vitrum, 

 a kind of thick glass). A glassy 

 lava, much resembling artificial 

 glass, but usually black and nearly 

 opaque ; it consists of silica and 

 alumina, with a little potash and 

 oxide of iron. 



Obsoles'cence (Lat. obsoles'co, I grow 

 out of use). The state of becoming 

 disused ; in medicine, applied to 

 the stage in diseased formations at 

 which they cease to undergo further 

 change. 



Ob'solete (Lat. obsoles'co, I grow out 

 of use). In botany, imperfectly 

 developed or abortive. 



Obstet'ric (Lat. obstet'rix, a midwife). 

 Relating to midwifery. 



Obtec'ted (Lat. ob'tego, I cover over). 

 Covered over ; applied to a form of 

 metamorphosis in insects in which 

 the wings and limbs are lodged in 



