Emily Dickinson Lexicon

PER-PEN-DIC'U-LAR, n.

1. A line falling at right angles on the plane of the horizon, that is, extending from some point in a right line toward the center of the earth or center of, gravity, or any body standing in that direction.
2. In geometry, a line falling at right angles on another line, or making equal angles with it on each side. – Encyc.