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OTI 



into bony tissue : osteogenetic, 

 a., 8st'&'d'j%n-et'ik, denoting the 

 soft, transparent substance in 

 bone which becomes ossified : 

 osteogeny, n., fa&fr&dfi&n-I, also 

 osteogenesis, n., tist'-g-'d-jen'-et-is, 

 the formation or growth of bone. 



osteoid, a., ost'&oyd (Gr. dsteon, 

 a bone ; eidos, resemblance), like 

 or resembling bone ; denoting a 

 class of tumours growing from 

 bone, which themselves contain 

 bone. 



osteology, n., fotf&W8>jt (Gr. 

 osteon, a bone ; logos, discourse), 

 that part of anatomy which treats 

 of the skeleton or bony fabric of 

 different animals ; comparative 

 anatomy. 



osteoma, n., fetf-from'-a (Gr. 8st- 

 e$n, a bone), an adventitious 

 growth, consisting of a purely 

 bony mass, set upon a bone, form- 

 ing with it an organic whole ; an 

 exostosis. 



osteomalacia, n., fist'-Z-d-mal-dk'- 

 I'd (Gr. ostedn, bone ; malakos, 

 soft), a diseased softening of the 

 bone. 



osteomyelitis, n., ft&6*mg&4* 

 is (Gr. osteon, bone ; muelos, 

 marrow), inflammation of the red 

 osseous medulla, and of the pulp 

 contained in the cancelli of 

 spongy bone. 



osteophyte, n., fot-tf-d-ftt (Gr. 

 ostedn, bone ; phtitds, planted, 

 grown from phud, I produce), a 

 term denoting a great variety of 

 bony growths which are formed, 

 for the most part, in an inflam- 

 matory exudation ; * exostoses ' 

 may be regarded as outgrowths 

 from bone, while ' osteophytes ' 

 seem only to be produced under 

 the influence of a bone, often 

 resulting, e.g., from ossification 

 of the exudation derived from 

 the adjacent hypersemic vessels. 



osteoporosis, n., dst'8-6-pdr-oz'-is 

 (Gr. ostedn, bone;_poms, a callos- 

 ity), a diseased state of bone 

 which presents an increase of 



size of the bone-cells, and a con- 

 sequent diminution of density, 

 the surface of the bone being at 

 the same time irregular and por- 

 ous: osteoporotic, a., tist'-frd-por- 

 dt'-ik, of or pert. to. 



ostiolum, n., fat-i'-dl'tim (L. ost- 

 wlum, a little door), in bot., the 

 orifice through which spores are 

 discharged ; the mouth of a 

 perithecium. 



ostitis, n., fot'itis (Gr. ostffin, 

 bone), a form of bone inflamma- 

 tion, which in its second stage 

 passes on to hardening or sclerosis, 

 or else to suppuration : osteoid, 

 a., tist'&oyd (Gr. eidos, resem- 

 blance), having the appearance of 

 bone. 



ostium abdominale, dst'i-urn ab- 

 dSm'-in-al'-e (L. ostium, a door, an 

 opening from 6s, a mouth ; 

 abdomindlis, pert, to the abdo- 

 men), the orifice at the fimbriated 

 extremity of the Fallopian tube : 

 ostium uterinum, ut'-er-ln'-um 

 (L. tiferinus, uterine), the orifice 

 at the uterine extremity of the 

 Fallopian ttibe. 



Ostracea, n. plu., ost>ra r -sli$-a, 

 also Ostraceans, n. plu., ftst-rd'- 

 sM-anz (L. ostred, an oyster), the 

 family of Bivalves of which the 

 oyster or ' ostrea ' is the type. 



Ostracoda, n. plu., dst'TaJc'dd-a 

 (Gr. dstrakon, a shell), an Order 

 of small Crustaceans enclosed in 

 bivalve shells : ostracoid, a., 

 ost'-rak-oyd (Gr. eidos, resem- 

 blance), having the nature of 

 shell. 



otic, a., tilf-ik (Gr. ous, the ear, 

 otos, of the ear), pert, to the ear; 

 employed in diseases of the ear : 

 otitis, n., ot'ltf'is, inflammation 

 of the ear, the position of which 

 is indicated by the adjectives 

 externa, media, and internet, : 

 otoconia, n., o^o-Un'-i-d (Gr. 

 Ictinia, dust), a small mass of 

 calcareous particles or crystals of 

 carbonate of lime, found in the 

 membranous labyrinth of the 



