cho·ri·amb 
(kôrē-ămb′, -ăm′)
(kôrē-ămb′, -ăm′)n.
A metrical foot consisting of a trochee followed by an iamb, much used in Greek and Latin poetry.
[Late Latin choriambus, from Greek khoriambos : khoreios, trochee (from khoros, chorus; see CHORUS) + iambos, iamb.]
cho′ri·ambic (-ămbĭk) adj.