1) Western medieval lyric form 
The kyrielle is a poetic form that originated in troubadour poetry. == Name and form == The name kyrielle derives from the Kýrie, which is part of many Christian liturgies. A kyrielle is written in rhyming couplets or quatrains. It may use the phrase `Lord, have mercy`, or a variant on it, as a refrain as the second line of the couplet or last .....
string of short lines in stanzas all ending with the same word
• (n.) A litany beginning with the words.
a French verse form in short, usually octosyllabic, rhyming couplets. The couplets are often paired in quatrains and are characterized by a refrain ...
A middle french verse form composed of quatrains which each share the same second and fourth lines.
Kyr`i·elle noun [ Confer French kyrielle .] A litany beginning with the words, 'Kyrie eleison.' Shipley. 
Medieval French form written in rhyming couplets (though often arranged in quatrains) and featuring repeated lines or refrains. An example of a kyrielle is A Lenten Hymn by Thomas Campion.