Emily Dickinson Lexicon

CHOR'I-AMB, or CHOR-I-AM'BUS, n. [Gr. χορειος, a trochee, and ιαμβος, iambus.]

In ancient poetry, a foot consisting of four syllables, of which the first and last are long, and the others short; that is, a choreus or trochee and an iambus united; as, nobilitas, anxietas. – Encyc.