iridal

[Lat. iris, gen it. irid ( is )=the rainbow; Eng. adj. suff. al.] Pertaining to or resembling the rainbow. IMG:content-0043.png:[blocks in formation] I-rid-oş'-mine, s . [Modern Latin irid (ium); osm ( ium ), with suff. -ine ( Min . ) (q. v.).] Min .: A hexagonal opaque mineral of tin-white or light steel-gray color and metallic luster. Hard ne , 6-7; specific gravity, 19-30-21-12. Composition: Iridium, 43-28-70-40; osmium, 17-20-40-85, . Found with platinum in Choco in South America, also in the Ural Mountains and in Australia. Varieties New jan skite and Si erskite. ( Dana .) 1-ris ( pl . I'-ri-dēs), s. (Lat. iris =Gr. iris =rainbow.] I. Ord . Lang.: The rainbow. II. Technically : i-rid-ec-tôme, s. [Gr. iris (gen it. iridos)=the rainbow, the iris, and ektome a cutting out: ek layers, an anterior epithelial layer, a posterior layer out, and temno =to cut.] Surg .: A knife for operations on the eye. i-rid-ěc-to-mỹ, 8. [IRIDECTOME.] Surg .: The act or operation of cutting out a portion of the iris for the purpose of forming an artificial pupil. Ir-id-es-çençe, s. [As if from a Lat. * irides cens , pr. par. of iridesco =to become like a rainbow; iris (gen it. irid is ) =a rainbow.] The quality or state of being iridescent; exhibition of colors like those of the rainbow. Ir-Id-es-çent, a. [IRIDESCENCE.) Prismatic, rainbow-like; exhibiting iridescence.