IRI 



222 



ISC 



perg'd (L. purgo, I cleanse, I 

 purify), the Jalap plant, a native 

 of the Mexican Andes, whose root 

 tubers in powder, or as a tincture, 

 is an active irritant cathartic ; 

 also called Exogonium purga : 

 I. Jalapa> jdl-cip'-d (Xalapa,. in 

 Mexico, where it grows abund- 

 antly), a species which yields 

 Mechoacan root, having purgative 

 properties : I. Orizabensis, dr-iz' 

 ab-$ns'is (in Brazil), supplies a 

 kind of Jalap, the Purgo Macho 

 of the Mexicans : I. simularis, 

 sim'ul'dr'is (L. simulo, I make 

 like), a species which furnishes 

 Tampico Jalap : I. Horsfallise, 

 htirs-fdwl'li'e (unascertained), 

 a species admirably suited for 

 training to a trellis, having 

 beautiful bright scarlet flowers. 



Iridacese, n. plu., ir'-id-d'sZ-e (Gr. 

 iris, the rainbow, the flag, iridos, 

 of the rainbow), the iris or flower- 

 de-luce family, an Order of herb- 

 aceous plants, so called in.allusion 

 to the variety and beauty of the 

 flowers : Iris, n. , Ir 'is, a genus of 

 plants^ a great favourite in the 

 flower garden : Iris Germanica, 

 ye>'raa^'$-r/(oforfrom Germany); 

 I. pallida, pal' lid- d (L. pallidus, 

 pale, pallid); I. florentina, 

 flor'-ent-in'-a (L. Morentinus, 

 Florentine from Florentia, 

 Florence), are species the root 

 stock of which yields orris root 

 which has a pleasant odour like 

 violets, and an acrid taste, arising 

 from the presence of a volatile 

 oil: I. pseudacorus, sud-dlc'- 

 or >us (Gr. pseudes^ false ; akoros, 

 the sweet flag), the yellow water 

 flag found in marshes, etc. , whose 

 seeds have been used as a substit- 

 ute for coffee. 



Iridsea, n., ir'id-e'd (L. iris, the 

 rainbow, the flag), a genus of 

 the Algse : Iridsea edulis, Vd-ul'te 

 (L. edulis, eatable), an edible 

 species of Algse. 



iris, n. , Ir '4s (L. iris, the rainbow, 

 the flag), the coloured circle 



which surrounds the pupil of the 

 eye ; a structure partly vascular, 

 partly muscular, loaded with 

 pigments, stretched before the 

 lens of the eye, separating the 

 anterior from the posterior 

 chambers ; in lot*. , see under 

 ' Iridacese : ' iritis,, n., ir-it'is, 

 inflammation of the iris of the 

 eye. 



Irish Moss, or Carrageen, the 

 Sphserococcus crispus, also called 

 Chondrus crispus, one of the 

 Algse which supplies a nutri- 

 tious article of diet. 



irrigation, n., ir'-ri-ga'-shtin (L. 

 irrigatus, watered, irrigated), a 

 medical treatment of an- injured 

 or inflamed part in which cold 

 water or a cooling lotion is made 

 to drop continuously on its 

 surface. 



irritant, n i? ir'it-dnt (L, irritus, 

 not ratified or settled), a substance 

 which, applied externally or 

 internally, gives rise to a greater 

 or less degree of inflammation. 



Isatis, n., is-dt'is (Gr.. isazo, I 

 make equal),, a genus of plants, 

 Ord. Cruciferse, so called because 

 it is believed by its simple applic- 

 ation to destroy all roughness of 

 the skin : Isatis tinctoria, tmgk- 

 tor'-i-a (L. tinctorius,. belonging 

 to dyeing), woad which, when 

 treated like indigo, yields a blue 

 dye : I. indigotica, m'-dig-dt'ik-d 

 (L. indigo, a blue colouring 

 matter), the Tein - Ching, or 

 Chinese indigo.. 



ischium, n., isk'i-um (Gr. ischion, 

 the hip), the hip-bone a spinous 

 process of the os innomatum : 

 ischial, a., isk'i-dl, pert, to the 

 hip-bone : ischial tuberosity, n., 

 the round knob of bone forming 

 that part of the ischium on which 

 we sit ; also called tuber-ischii, 

 n., tuo'er-isk'i'i (L. tuber, a 

 hump) : ischialgia, n.,isk'i-dlj'i-d 

 (Gr. algos, pain), pain in or near 

 the hip : ischiatic, a., isk'i-dt'ik, 

 of or pert, to the hip : ischio, 



