| Webster's Online Dictionary |
| Part of Speech | Definition | |
| Expression | 1. The mirror on the index of a quadrant, sextant, etc.[Websters]. | |
| Top | ||
| Expressions | Definition | ||
| Index glass | The mirror on the index of a quadrant, sextant, etc. Source: Webster's Revised Unabridged Dictionary. | ||
Source: compiled by the editor from various references; see credits. | Top | ||