Misra'
A misra is a term used in Arabic, Persian, Turkic and Urdu poetry, which means 'half of a bayt'.
In Arabic poetry, a misra therefore means half of one line of poetry, a hemistich. The two halves of the line are separated by a space.
In Persian, Turkic and Urdu poetry, a misra means one whole line of poetry. A ruba'i is a poem of four misras, i.e. two bayts.