| Webster's Online Dictionary |
| Part of Speech | Definition | |
| Expression | 1. (Opt.), the index of refraction of a substances when the ray passes into it from a vacuum.[Websters]. | |
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| Expressions | Definition | ||
| Absolute refractive index | (Opt.), the index of refraction of a substances when the ray passes into it from a vacuum. Source: Webster's Revised Unabridged Dictionary. | ||
Source: compiled by the editor from various references; see credits. | Top | ||
| Expressions | Domain | Definition | |
| Absolute refractive index | Aerospace | = index of refractory (sense 1). (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||