a combining form of Latin origin used, with the meanings "rainbow," "iridescent," "iris (of the eye)," "Iris (the genus)," and "iridium," in the formation of compound words: iridopupillary; iridosmine; iridotomy.
Also, esp. before a vowel, irid- .
[ comb. form repr. NL, L, Gk irid- (s. of îris ) rainbow, iris, etc.; see IRIS ]