Part of Speech: Adjective

Definition: Showing luminous colors that seem to change when seen from different angles.

Source: Dictionary.com

Found In: “Punishment” By Nancy Miller Gomez

“The Iridescent scream of a sharp-shinned hawk circling somewhere in the pastel wash” Line 8-9.

A hawks screams cannot be Iridescent. The writer was using figurative language because a scream is not in color.