a.1.Exhibiting the prismatic colors; irised; iridescent.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The condition of this set was stable, though every specimen is fragmented as well as irisated. Only two specimens had to go over some extra care--the bead of Set I and bead n.o 4 of Set II--by adding a paraloid solution in the vacuum.