Emily Dickinson Lexicon

AM'PHI-BRACH, n. [Gr. αμφι, and βραχυς, short.]

In poetry, a foot of three syllables, the middle one long, the first and last short; as hăbērĕ, in Latin. In English verse, it is used as the last foot, when a syllable is added to the usual number forming a double thyme; as, The piece, you think, is incorrect, why take it? – Pope. Trumbull.