1) Poetic form 
A monostich is a poem which consists of a single line. The following is an example: A monostich could be also titled; due to the brevity of the form, the title is invariably as important a part of the poem as the verse itself: Some examples of one-line poems were created by Ancient authors (Martial e.g.). Modern monostich was started in Russia in ...
• (n.) A composition consisting of one verse only.
Mon'o·stich noun [ Greek ..., from ... consisting of one verse; 
monostich 1. A poem, or an epigram, consisting of a single metrical line. 2. A single metrical line of poetry.
a poem or epigram consisting of a single metrical line. · a single line of poetry.