Emily Dickinson Lexicon

HORN'PIPE, n.

1. An instrument of music in Wales, consisting of a wooden pipe with horns at the ends; one to collect the wind blown from the mouth; the other to carry off the sounds as modulated by the performer. [W. pib-corn.] Encyc.
2. An air or tune of triple time, with six crotchets in a bar; four to the descending beat, and two to the ascending. Encyc.