IRIDOSCHISIS 



626 



IRREGULARITY 



Iridoschisis, or Iridoschisma (ir-id-os' -kis-is or ir-id- 



os-kiz'-mah) \lpig, iris; ax'^ig, ax'tofia, cleft]. 



Coloboma of the iris. 

 Iridotome (ir'-id-o-tom) \lpig, iris; TOfiy, a cutting]. 



A cutting-instrument employed in iridotomy. 

 Iridotomy (ir-id-of -o-me) \_lpig, iris; rofif], section]. 



An incision of any kind into the iris. 

 Iridotromos (ir-id-of -ro-mos) [Jpig, iris ; rpo/iog, 



tremor]. Hippus ; tremor of the iris. 

 Iris (i'-ris) [tpig, a colored halo or circle]. I. The 



anterior portion of the vascular tunic of the eye, 



attached to the pectinate ligament and ciliary body ; 



its central aperture forms the pupil. 2. Blue-flag. 



The roots of /. versicolor. It contains a resinous 



Iris and Choroid. 



I. Optic nerve. 2, 2, 2, 2. Sclerotic, divided in four equal parts 

 and turned back. 3,3. Pigmentarv granulation of its inner 

 layer. 4. Section of lamina fusca. 5, 5, 5, 5. Cornea, divided 

 in four equal parts. 6, 6. Canal of Schlemm. 7. Outer sur- 

 face of choroid 8. Superior and internal trunk of vasa vor- 

 ticosa. 9, 9. Irregular border limiting the choroid zone 

 posteriorly. 10, 10 Anterior half of this zone ; ciliary mus- 

 cle. 11, 11. Ciliary nerves. 12. Long ciliary artery. 13,13, 

 13, 13. Anterior ciliary arteries. 14. Iris. 15. Small arterial 

 circle of iris. 16. Pupillary orifice. 



Section of Ciliary 

 Body and Iris. 



1, Ciliary processes. 



2, 2 Their bases or 

 rounded extremities. 



3, 3. Their apices. 4. 

 A process with bi- 

 furcated extremity. 

 5, 5. Reticulated 

 folds, or ciliary pro- 

 cesses of the second 

 order. 6, 6. Venules 

 that emanate from 

 these. 7, 7. Ora ser- 

 rata of choroid 8, 



8. Veins of choroid. 



9. Section of iris. 



10. 10. Circumfer- 

 ence of iris. 11, 11. 

 Small ring of iris. 

 12, 12. Large ring 

 of iris 



principle, iridin. The fresh rhizome is purgative, 

 emetic, and diuretic, and is serviceable in catarrh of 

 the duodenum, and in malarial ailments. I., Ext. 

 Dose gr. j-v. I., Ext. Fid. Doseniy-sjj. IricLn, 

 .the oleoresin, is a cholagogue. Unof. Dose gr. j-v. 

 The genus Iris embraces many other species, some of 

 them purgative, and some reputed to be poisonous. 

 See Orris-root. I., Absence of. See Irideremia. 

 I., Angle of, that formed by the junction of the 

 cornea and the iris. I. -contraction. See Reflexes, 

 Table of. I. -green. Same as Bladder-g, 

 I., Prolapse of (or Hernia of), protrusion of a por- 

 tion of the iris through an opening in the cornea or 

 sclera ; when the iris is adherent the condition is 

 called anterior synechia ; when the iris is adherent 

 to the lens behind, the condition is called posterior 

 synechia. I., Tremulous, arises from non-support of 

 the iris in aphakia or dislocation of the crystalline lens. 



Irish (i'-rish) [ME., Irish, Irish]. Pertaining to 

 Ireland. I. Ague. Synonym of Typhus Fever, q.v. 

 I. Moss. See Chondrus. 



Irisin (i'-ris-in) [Ipig, iris]. The precipitate from a 

 tincture of the root of Blue-flag, Iris versicolor ; it is 

 cholagogue, sialagogue, and diuretic. Dose 2 to 4 

 grains. Unof. 



Iritic (i-rit'-ik) [Ipig, iris; trig, inflammation]. Of the 

 nature of, pertaining to, or affected with, iritis. 



Iritis (i-ri'-tis) \lpig, iris ; trig, inflammation]. Inflam- 

 mation of the iris, called after its origin, or character, 

 blennorrhagic, rheumatic, diabetic, syphilitic, plastic, 

 serous, primary, secondary. I., Condylomatous, 

 /. papulosa ; that accompanied by the formation of 

 papules or condylomata in the iris. I. gummosa, 

 that in which gummata are formed in the iris. I, 

 papulosa. See /. , Condylomatous. 



Iritomy (i-rif -o-me). See Iridotomy. 



Iron (i'-ern) [ME., iron, iron]. See Ferrum. I. 

 Bath. See Bath. I. Minium. Same as Colcothar. 

 I. Wood, the heart-wood of Ostrya virginica, a 

 tonic, antiperiodic, and alterative. It has been 

 successfully used in malarial diseases, neuralgia, and 

 strumous affections. Dose of the fld. ext. , ^ss-j. 

 Unof. 



Irradiating (ir-ra' -de-a-ting) \irradiare, to emit rays in 

 every direction]. Radiating from a center, as a pain 

 arising from a definite focus of irritation. 



Irradiation (ir-ra-de-a' -shun) \irradiatio ; irradiare, to 

 emit rays in every direction]. A phenomenon in 

 which, owing to the difference in the illumination of 

 the field of vision, or its background, objects appear 

 much larger than they really are. 



Irreducible (ir-re-dils'-ibl) [in, not ; reducere, to 

 back]. That which cannot be reduced or restored to 

 its normal condition. In chemistry, applied to a 

 compound that cannot be separated. In surf 

 applied to a fracture or dislocation that cannot be 

 replaced. I. Hernia. See Hernia. 



Irregular (ir-reg'-u-lar) [in, not; regula, rule]. Not 

 regular ; not normal or according to rule ; not rhythmic ; 

 not recurring at proper intervals. 



Irregularity (ir-reg u-lar'-it-e) [in, not; regula, a rule]. 

 Lack of regularity ; unevenness. I. of the Teeth, 

 deviation of the teeth from their natural arrangement 

 is of frequent occurrence, and is dependent upon I 

 variety of causes. The following are among th< 

 frequent: I. Want of synchronism between tin 

 destruction of the roots of the temporary teeth ami 

 the growth of the permanent teeth. 2. The premature 

 removal of one or more of the temporary teeth, v 

 Disproportion between the size of the alveolai 

 and the teeth. 4. Supernumerary teeth. 5. Mil 

 formation of the jaws. 



