PERIODICITY 



1049 



PERIOTIC 



See 

 See 



The 



periods or times of the year, or one of which the 

 manifestations recur at regular intervals, e.g., the 

 malarial fevers, relapsing fever. P. Swelling. 

 :io-tteurotic Edema. P. Vomit of Leyden. 

 Angio-neurotit Edema. 

 Periodicity (pe-re-o-dis' -it-e) [-epiodoc, a period], 

 tendency of certain diseases or morbid phenomena 

 to recur at regular intervals. 

 Periodontal (per-e-o-don' -tal) [nepi, around ; bdoiq, 

 tooth]. I. Surrounding a tooth or its root. 2. The 

 periosteum of an alveolus, or some other membrane 

 lUsue surrounding a tooth, 

 iodontitis ( per-e-o-don-ti' -tis) [~tpi, about ; bdobc, 

 irtq, inflammation] . Inflammation of the peri- 

 ental membrane, the lining membrane of the cavity 

 f a tooth. See Pericementitis. 

 odontium (per-e-o-don'-she-um) \_~epi, around; 



f, tooth]. The membrane surrounding a tooth, 

 iodoscope (pe-re-od' -o-skop) \jrepio6oc, a period ; 

 - - .to inspect]. A kind of dial to show the pro- 

 bable time of confinement. 

 Periodynia (per-e-o-din' -e-ah) \irepi, around ; bivvy, 



pain]. Severe general pain throughout the body. 

 Perioesophagitis (per-e-e-sof-aj-i 1 -tis). See Periesoph- 



agitis. 

 Perionychia (per-e-o-nik'-e-ah) \xepi, around; bw~, 



nail]. Inflammation around the nails. 

 Perionyx (per-e-on'-iks) \_~epi, about; bw!; (bwx-) a 

 nail, claw, talon, hoof]. In biology, a small band of 

 the epitrichium (eponychium) which persists across the 

 root of the nail in the development of that organ. 

 Perionyxis (per-e-o-niks'-is). Synonym of Perionychia. 

 Perioophoritis (per-e-o-off-o-ri' -tis) [—epi, around ; 

 • egg; £°P*C» bearing; trie, inflammation]. In- 

 flammation of the peritoneum and connective tissue 

 covering the ovary. It may be acute or chronic, and 

 leads to the formation of adhesions. It is usually 

 due to tubal disease. 

 Periophthalmitis (per-e-off-thal-mi' '-tis) [~epi, around; 

 eye; inc, inflammation], inflammation of 

 the tissues surrounding the eye. 

 Perioptic i per-e-op'-tik) [~epi, around ; otttikoc, seeing] . 

 i. Surrounding the orbit, or the eye. 2. Of, or per- 

 taining to, the tissues about the eye. 

 Periopticon {per-e-op* -tik-on) [~ep«, about; brrriKoc, of 

 seeing]. In biology, a complex nerve-structure just 

 back of the basilar membrane in the eyes of insects. 

 Hickson. ) 

 Perioptometry {per- e-op- lorn'- et- re) \_~ipi, around ; 

 ;, visible; uirpov, measure]. The measurement 

 of the limits of the visual field in its several dimensions. 

 It includes, also, the detection and measurement of 

 defects in the field of vision. 

 Perioral f per-e-o* '-ral) [~epi, around ; os, oris, the 



mouth] . Surrounding the mouth ; circumoral. 

 Periorbita (per-e-or' -bit-aK) [~epi, around ; orbita, or- 

 bit]. The periosteum of the eye-socket. 

 Periorbital (per-e- or'-bit-al) [^repi, around ; orbita, 

 orbit]. Pertaining to the periosteum of the socket of 

 the eye or to the tissues about the orbit. 

 Periorbitis (per-e-or-bi'-tis) [~epi, around; orbita, or- 

 oit ; trie, inflammation]. Inflammation of the peri- 

 orbita. 

 Periorchitis ( per-e-or-ki' -tis) [~epi, around ; bpxiq, tes- 

 ticle ; trie, inflammation]. Inflammation of the tissues 

 surrounding the testicle, especially of the tunica vagi- 

 nalis testis. P. adhaesiva. a form in which adhesions 

 between the two layers of the tunica vaginalis are 

 formed. 

 Periosteal (per- e-os / - te-al) [irepi, around; bariov, 

 bone]. Pertaining to the periosteum. P. Bone, the 

 bone formed by the cells of the osteogenic layer of 



the periosteum, as distinguished from the central spongy 

 endochondral bone. P. Reflex. See Reflexes. Table 



Periosteedema (per-e-os-te-e-de'-mah) [Trept, around ; 

 bariov, bone ; oidr/ua, edema]. Edema of the perios- 

 teum. 



Periosteitis (per-e-os-fe-i' '-tis). See Periostitis. 



Periosteoma (per- -e -os- te - o / - man) [~epi, around ; 

 bariov, bone; bua, tumor]. An osteoma developed 

 from the periosteum. 



Periosteo-osteomyelitis (per-e-os' -te-o-os' -te-o-mi-e-li' - 

 tis) \_~epi, around ; bariov, bone ; five/.6c, marrow ; 

 trie, inflammation]. Inflammation of the periosteum 

 and medulla of a bone. 



Periosteophyma ( per-e-os-te-o-fi' -mah) \rcepi, around ; 

 bariov, bone ; pv.ua, growth]. Swelling of the perios- 

 teum ; also, a periosteophyte. 



Periosteophyte (per - e - os*- te - o -fit) [~ep', around ; 

 bariov, bone; pvrov, growth]. A morbid osseous 

 formation upon or proceeding from the periosteum. 



Periosteosis (per-e-os-te-o' -sis). Synonym of Perios- 

 tosis. 



Periosteotome (per - e - os 1 - te -o - torn) [~epi, around ; 

 bariov, bone ; rouij, a cutting]. A cutting instrument 

 for use in periosteotomy. 



Periosteotomy (per-e-os-te-ot'-o-me) [~epi, around; 

 bariov, bone ; rouij, a cutting]. Surgical incision of 

 the periosteum. 



Periosteous (per-e-os' -te-us). Same as Periosteal. 



Periosteum (per-e-os' -te-um) [_~cpi, around ; bariov, 

 bone]. A fibrous membrane that invests the surfaces 

 of bones, except at the points of tendinous and liga- 

 mentous attachment, and on the articular surfaces, 

 where cartilage is substituted. At the attachment of 

 tendons the periosteum blends with the fibers of the 

 tendons. The periosteum consists of two layers, 

 an ectal, fibrous, and an ental, osteogenetic layer. 

 The periosteum serves as a medium for the attachment 

 of tendons, and as the means of nourishment and 

 regeneration of bone. 



Periostitic ( per-e-os- tit* -ik)[—epi, around ; bariov, bone ; 

 trie, inflammation]. Pertaining to, resembling, or 

 affected with, periostitis. 



Periostitis (per-e-os-ti'-tis)\TTepi, around ; bariov, bone ; 

 iriq, inflammation]. Inflammation of the periosteum. 

 P.. Dental, inflammation of the investing membrane 

 of the roots of the teeth. P., Diffuse, a serious in- 

 flammation usually involving the periosteum of long 

 bones. P., Hemorrhagic, a condition accompanied 

 by bleeding between the periosteum and the bone. 



Periostoma (per-e-os-to / -mah) [~epi, around ; bariov, 

 bone; bua, tumor]. Any morbid osseous growth 

 occurring on or surrounding a bone. 



Periostosis (per-e-os-to' -sis) [irepi, around ; bariov, 

 bone]. The formation of periostoma. Inflammatory 

 hypertrophy of bone. 



Periostotomy (per-e-os-tof '-o-me). Synonym of Peri- 

 osteotomy. 



Periostracal (per-e-os' -trak-al) [~epi, around ; barpa- 

 kov, a shell]. Pertaining to the periostracum. 



Periostracum ( per-e-os' -trak-nm)[—epi, around ; bar pa- 

 urn; shell]. In biology, the horny epidermis investing 

 the shells of molluscs. 



Periotic (per-e-o'-tik) \nepi, around; oic, ear]. I. 

 Situated or occurring around the ear. A term also 

 applied to the petrous and mastoid parts of the tem- 

 poral bone. 2. Of or pertaining to the region or 

 tissues immediately about the internal or true ear. P. 

 Capsules. Huxley's name for the independent carti- 

 lages that appear very early around the otocysts and 

 later become integral parts of the primitive chondro- 

 cranium by coalescing with the occipital cartilage. It 



