English Explanatory Dictionary

positive crystal

English dictionary entry

Meanings

noun
  1. A doubly refracting crystal in which the index of refraction for the extraordinary ray is greater than for the ordinary ray, and the former is refracted nearer to the axis than the latter, such as quartz and ice; as opposed to negative crystal: one in which this characteristic is reversed, such as Iceland spar or tourmaline.

Word forms

positive crystal positive crystals

Antonyms

negative crystal
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