dĭĭambus, i, m., = διΐαμβος,
a double iambus : ⏑ - ⏑ -, Don. p. 1739 P.; Diom. p. 477 ib. et saep. (in Ter. Maur. p. 2415 P., written as Greek).
·noun A double iambus; a foot consisting of two iambuses (/ / / /). ...
Webster's Dictionary of the English Language