GLOSSARY. 



123 



Or'thoepy (Gr. bpBos, orthos, right ; 

 eVos, ep'os, a word). The correct 

 pronunciation of words. 



Orthog'onal (Gr. bpdos, orthos, 

 straight ; yoivia, gonia, an angle). 

 At right angles, or perpendicular. 



Orthog'raphy (Gr. opOos, orthos, 

 right ; ypatpw, graph'o, I write). 

 The art or practice of writing words 

 with the proper letters : in archi- 

 tecture, the elevation of a building, 

 showing all the parts in their due 

 proportions. 



Orthopnoe'a (Gr. opOos, orthos, upright; 

 irvfu, pnco, I breath). A diseased 

 state in which breathing can only 

 be performed in the erect position. 



Orthop'tera (Gr. opdos, orthos, straight ; 

 irrepou, pter'on, a wing). An order 

 of insects, which have the wings 

 disposed, when at rest, in straight . 

 longitudinal folds ; as the cricket i 

 and grasshopper. 



Orthot'ropous (Gr. bpOos, orthos, \ 

 right ; rpeirca, trep'o, I turn). 

 Turned the right way ; applied in 

 botany to the ovule where its parts 

 undergo no change of position 

 during growth. 



Oryctog'iiosy (Gr. opvicros, orulc'tos, 

 fossil, or dug out ; yvuarts, gnosis, 

 knowledge). The description and 

 classification of minerals. 



Oryctol'ogy (Gr. bpvKTos, orulc'tos, 

 fossil ; \oyos, logos, a discourse). 

 The description of fossils. 



Oscilla'tion (Lat. oscil'lum, a swing). 

 A swinging backwards and for- 

 wards ; centre of oscillation is the 

 point into which the whole moving 

 force of a vibrating body is concen- 

 trated. 



Os'cula (Lat. plural of os'culum, a 

 little mouth). The larger orifices 

 on the surface of a sponge. 



Os'mazome (Gr. oo>w?, osrne, odour; 

 fatsos, ziimos, juice or soup). The 

 name given to the extractive matter 

 of muscular fibre, which gives the 

 smell to boiled meat. 



Os'mose (Gr. wtfew, otheo, I impel). 

 The process by which fluids and 

 gases pass through membranes. 



Os'seous (Lat. os, a bone). Formed 

 of, or resembling bone. 



Os'sicle (Lat. ossic'uhim, from os, a 

 bone ; ulum, denoting srnallness). 

 A little bone. 



Ossif'erous (Lat. os, a bone; fer'o, I 

 bear). Producing or containing 

 bones. 



Ossif 'ic (Lat. os, a bone ; fcufio, I 

 make). Making bone. 



Ossifica'tion (Lat. os, a bone ; facfio, 

 I make). A change into a bony 

 substance ; the formation of bones. 



Os'sify (Lat. os, a bone; fac'io, I 

 make). To form bone ; to become 

 bone. 



OssiVorous (Lat. os, a bone ',vcro, I 

 devour). Eating bones. 



Os'teal (Gr. bareov, os'teon, a bone). 

 Belonging to bone. 



Os'teine (Gr. cxr-reav, os'teon, a bone). 

 The tissue of bone. 



Ostei'tis (Gr. ocneov, os'teon, a bone ; 

 itis, denoting inflammation). In- 

 flammation of bone. 



Osteoden'tine (Gr. ba-reov, os'teon, a 

 bone ; Lat. dens, a tooth). A 

 structure formed in teeth, in part 

 resembling bone. 



Osteog'eny (Gr. oo-reoc, os'teon, a 

 bone ; yeifvaof, genna'n, I produce). 

 The formation or growth of bone. 



Osteoid (Gr. b-rreov, os'teon, a bone ; 

 flSos, eidos, form). Resembling 

 bone. 



Osteol'ogy (Gr. ba-reov, os'teon, a 

 bone ; \oyos, logos, discourse). A 

 description of the bones. 



Osteomala'eia (Gr. ocrreov, os'teon, a 

 bone ; /j.a\a.Kos, mal'akos, soft). A 

 diseased softening of the bones. 



Osteophyte (Gr. oa-reov, os'teon, a 

 bone ; <pva, phuo, I grow). A 

 bony tumour or projection. 



Os'teotrite (Gr. cxTreov, os'teon, a 

 bone ; Lat. tero, I rub). An instru- 

 ment for removing diseased bones. 



Osteozoa'ria (Gr. btrreov, os'teon, a 

 bone'; o>ov, zoon, an animal). A 

 name for the vertebrate division of 

 the animal kingdom, comprising 

 those animals which possess bones. 



Ostra'cea ( Gr. ocnpeov, os'treon, an 

 oyster). A family of bivalve mol- 

 luscous invertebrate animals, of 

 which the oyster is an example. 



Ostrap'oda (Gr. ba-rpeov, os'lreon, an 



