'Prime vertical dial' definitions:
Definition of 'Prime vertical dial'
From: GCIDE
- Vertical \Ver"ti*cal\, n.
- 1. Vertical position; zenith. [R.] [1913 Webster]
- 2. (Math.) A vertical line, plane, or circle. [1913 Webster]
- Prime vertical, Prime vertical dial. See under Prime, a. [1913 Webster]