Dictionary definitions
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prime vertical dial
From The Collaborative International Dictionary of English v.0.48:
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]
