OPERCULUM 



930 



OPHTHALMIA 



Operculum {o-per' -ku-lum) [L. : pi., Opercula]. A lid 

 or cover. In biology, alia, cap, flap, or cover; ap- 

 plied to various occlusive apparatuses, structures, or 

 organs, in plants and animals, as the cover of the cap- 

 sule in mosses, the plate for closing the aperture of 

 gasteropod shells, the feathered flaps of the ear of a 

 bird, etc. In ichthyology, an osseous formation which, 

 in part, closes the great opening of the gills. In an- 

 atomy, the convolutions covering the insula, consisting 

 of the operculum proper, preoperculum, suboperculum, 

 and postoperculum. O., Burdach's, the O. insula. O. 

 cutis, the epidermis. O. ilei, the valve of Bauhin. 

 O. insulae, the gyri of the brain over the insula. 

 They are the subfrontal, the precentral and post- 

 central, and the inferior central gyri. O. laryngis, 

 the epiglottis. O. oculi, the eyelids. O. sellae, 

 the dura over the pituitary body. 



Operimentum {o-per- im-en' -turn). Synonym of the 

 Membrana tympani, q. v. 



Opertorium {o-per-to 1 're-um) [L. , a cover]. Same as 

 Operculum. 



Ophelic Acid {o-fel'-ik), C 13 H 20 O 10 . An amorphous 

 sticky substance found in Chiretta. It is soluble in 

 water, in ether, and in alcohol. 



Ophiasis {off-i' -as-is) \b<f>iaoLC, serpentine baldness]. 

 Alopecia areata in which the baldness progresses in a 

 serpentine form. [Old.] 



Ophicephalous {off-is-ef'al-us) [o(pig, a serpent ; ice<pa?J/, 

 the head]. Having a head like that of a serpent. 



Ophidomonas sanguinea {off-id-o'-mo-nas san-gwin'- 

 e-ah) [L.]. An old name for Beggiatoa roseo-persicina. 

 See Bacteria, Synonymatic Table of. 



Ophiography {off-e-og 1 '-ra-fe) [_b<j>ig, a serpent ; ypa<j>eiv, 

 to write]. Descriptive ophiology. 



Ophioid {off'-e-oid) [octuc, a serpent ; eldog, like]. Re- 

 sembling a serpent. 



Ophiolatry {off-e-ol' '-at-re) [btyig, a serpent ; larpeia, 

 worship]. Serpent- worship. 



Ophiology {off-e-ol' -o-je) [b<pig, a serpent ; Myog, science] . 

 The scientific study of serpents. 



Ophiophagous {off-e-off'-ag-us) [otyig, a serpent ; (payelv, 

 to eat]. Feeding upon serpents. 



Ophiosis {off-e-o' -sis) [dcpig, serpent]. Circumscribed 

 baldness with scaliness. 



Ophioxylin {off-e-oks'-il-in) \_b(pig, a serpent ; %Wkov, 

 wood] , C 16 H 13 6 . A yellow crystalline body obtained 

 from Ophioxylon serpenlinum , a purgative and anthel- 

 mintic ; its solutions stain first yellow, then brown. 



Ophioxylon, Ophioxylum {off-e-oks'-il-on, off-e-oks'-il- 

 um) \_b<t>ig, a serpent ; %v?.ov, wood]. A genus of apo- 

 cynaceous plants ; serpent-wood. O. serpentinum, 

 East Indian snake-root, used as an oxytocic and as a 

 remedy for snake-bite. Unof. 



Ophryitis (off-re-i'-tis) [bypvg, brow ; trig, inflamma- 

 tion]. Inflammation of the eyebrow. 



Ophryocystis {off-re-o-sis' '-lis) \b<ppvg, eyebrow ; Kvcrig, 

 bladder]. A parasitic sporozoon. 



Ophryo-iniac {off'-re-o-in'-e-ak)\b$pvg, eyebrow ; iviov, 

 occiput]. Pertaining to the ophryon and the inion. 



Ophryon {off ' -re-ori)\b$pvg, eyebrow]. In craniometry, 

 the middle of a line drawn across the forehead at the 

 level of the upper margin of the orbits. See Cranio- 

 metric Points. 



Ophryo-opisthiac {off '' '-re-o-opis 1 '-the-ah) [b<ppvg, eye- 

 brow ; biriafftng, hinder]. Pertaining to the ophryon 

 and the opisthion. 



Ophryoscolex {off-re-o-sko' -leks) [b<j>pvr, brow ; rrKulrj^ , 

 worm : //., Ophryoscolices']. A genus of endopara- 

 sitic peritrichous infusorians, representatives of which 

 almost constantly inhabit the stomachs of cattle and 

 sheep. See Parasites {Animal), Table of. 



Ophryphtheiriasis {off-rif-thi-ri' -as-is) [b<f>pvg, eye- 



brow; Qdeipiaoig, pediculosis]. Pediculosis of tl 

 eyebrows and eyelashes. 



Ophrys {off'-ris) [b(j>pvg, eyebrow]. The eyebrow. 



Ophrytic {off-rit'-ik) [bippvg, eyebrow]. Pertaining I 

 the eyebrow. 



Ophthalmagra {off- thai- ma'-grah) [b<j>da!/i6g, eye 

 aypa, a seizure]. Gouty or rheumatic pain in the ey< 



Ophthalmalgia {off-thal-mal' -je-ali) [btytia'Afibg , eye 

 akyog, pain]. Neuralgia of the eye. 



Ophthalmalgic {off-thal-mal' -jik) \_bfftaAfiog ,eye ; d/.ya 

 pain]. Pertaining to ophthalmalgia. 



Ophthalmanthracosis {off- thai - man - thrak - o' -si 

 \_b(p6aX/xoc, eye; avOpanuaic, anthrax]. Anthrax ii 

 volving the eyelid. 



Ophthalmatrophy {off-lhal-mat'-ro-fe) [bd>f)a'/nnr. eve 

 arpoqia, atrophy]. Atrophy of the eyeball. 



Ophthalmecchymosis {off- thai- me k -i m-o' -si. 

 [b<j>0a?,/w(; , eye ; ekxv/uugic, ecchymosis]. A conjum 

 tival effusion of blood. 



Ophthalmedema {off-thal-me-de' -mah) [6o0a//jof , eye 

 oidrjua, edema]. Conjunctival edema. 



Ophthalmencephalon ( off-thai- men-sef'-al-on) [« 

 dakfidq, eye; eyKefa?.og, in the skull]. The portic 

 of the eye developed from the neural epiblast. 



Ophthalmentozoon {off-thal-men-to-zo' -on) \b<fidkJA 

 eye; evrdg, within; fwov, animal]. An intraocul; 

 parasite. 



Ophthalmia {off-thai' -me-ah) [bcbdalfiog, eye]. An n 

 flammation of the superficial tissues of the eye, an 

 especially of the conjunctiva. O. angularis. Tl 

 same as Canthitis. O., Army, purulent conjunctiva 

 O. arthritica. A synonym of. Glaucoma. 

 Asiatic. See Trachoma. O., Brazilian, a for 

 of xerophthalmia occurring in poorly-nourisln 

 children in Brazil ; the cornea first dries ar 

 is finally destroyed. O., Catarrhal, a synonym ( 

 simple conjunctivitis ; a hyperemia of the conjunctiv 

 with a catarrhal or muco-purulent secretion. Cj 

 Croupous, a rare disease, characterized by a severj 

 usually painless, swelling of the lids, a membrane 

 exudation upon the surface of the conjunctiva, and; 

 scanty sero-purulent discharge. It occurs only 

 children, but no distinct cause is known. O., Dipl 

 theric, a contagious variety of ophthalmia, charactt j 

 ized by a rigid and painful swelling of the litis, 

 scanty sero-purulent or sanious discharge, and : 

 exudation within the layers of the conjunctiva wlii > 

 leads to the death of the invaded tissues, and tenc' 

 by spreading to the ocular conjunctiva and by prt 

 sure, to destroy the cornea. The membrane is of adu i 

 grayish-red appearance and is intimately connect 

 with the conjunctival tissues. O., Dry, a synonjj 

 of Xerophthalmia. O., Egyptian. See Tracks 

 O., Electric, an ophthalmia sometimes occurri 

 in workmen exposed to the glare of electric lip 

 O., Follicular, an affection of the conjunctiva, as 

 ciated with the presence of small pinkish promineml 

 in the conjunctiva, chiefly located in the retrotar 

 folds, and usually arranged in parallel rows. 1 

 disease is often due to poor hygienic surroundings • 

 may become epidemic. O., Gonorrheal, an aoj 

 and severe form of purulent conjunctivitis, - 

 infection from urethral discharges containing the got' 

 coccus of Neisser. See Bacteria, Synonymatic T 

 of. O., Granular. See Trachoma. O., He 

 pickers', a form of ophthalmia clue to the imp' 

 tion in the cornea of the spinous baits from 

 bracts of the hop. O. humida, conjunctivitis wj 

 profuse discharge. O., Lacrymal, a form < >t dm 

 conjunctivitis depending upon obstruction ol the. 

 rymal passages. O., Leukorrheal, ophthalmit 

 posed to be due to infection with leukort 



