| Webster's Online Dictionary |
| Part of Speech | Definition | |
| Expression | 1. (Astron. & Surv.), the straight edge of the alidade or ruler along which a straight line is to be drawn.[Websters]. | |
| Top | ||
| Expressions | Definition | ||
| Fiducial edge | (Astron. & Surv.), the straight edge of the alidade or ruler along which a straight line is to be drawn. Source: Webster's Revised Unabridged Dictionary. | ||
Source: compiled by the editor from various references; see credits. | Top | ||