dis·tich 
(dĭstĭk)
(dĭstĭk)n. pl. dis·tichs
1. A unit of verse consisting of two lines, especially as used in Greek and Latin elegiac poetry.
2. A rhyming couplet.
[Latin distichon, from Greek distikhon, from neuter of distikhos, having two rows or verses : di-, two; see DI-1 + stikhos, line of verse; see steigh- in the Appendix of Indo-European roots.]