Jisho

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Noun
1. optic axis (of a crystal); optical axisPhysics
Wikipedia definition
2. Optic axis of a crystalThe optic axis of a crystal is the direction in which a ray of transmitted light suffers no birefringence (double refraction). Due to the internal structure of the crystal (the specific structure of the crystal lattice, the form of atoms or molecules of its components), light behaves differently when propagating along the optic axis than in other directions. Light propagating along the optic axis of a uniaxial crystal, has no unusual results.
Read “Optic axis of a crystal” on English Wikipedia
Read “光学軸” on Japanese Wikipedia
Read “Optic axis of a crystal” on DBpedia

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