| NOUN | shape | angle of extinction, extinction angle | the angle from its axis that a crystal must be rotated before appearing maximally dark when viewed in polarized light |
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| Meaning | The angle from its axis that a crystal must be rotated before appearing maximally dark when viewed in polarized light. | |
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| Synonym | extinction angle | |
| Broader | angle | The space between two lines or planes that intersect |
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