In Greek mythology, the goddess of the rainbow.
The third Iris was a light-draft monitor built as Shiloh (q.v.) by George C. Bestor at St. Louis in 1865. She had no service before being laid up at Mound City, 111. in 1866. She was renamed Iris 15 June 1869 and was laid up at New Orleans until 17 September 1874 when she commissioned briefly. After decommissioning 5 October 1874, Iris was sold at New Orleans.