"optic axis" meaning in English

{
  "forms": [
    {
      "form": "optic axes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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        "1": "optic axes"
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      "expansion": "optic axis (plural optic axes)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "attestations": [
        {
          "date": "from 17th c.",
          "references": []
        }
      ],
      "categories": [
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          "_dis": "67 33",
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          "parents": [],
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          "ref": "1665, Robert Hooke, Micrographia, section XXXIX:",
          "text": "[B]inocular creatures can in an instant […] move their eyes so as to direct the optick Axis to any point […].",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The optical axis."
      ],
      "id": "en-optic_axis-en-noun-RShT~REP",
      "links": [
        [
          "optical axis",
          "optical axis"
        ]
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    },
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      "attestations": [
        {
          "date": "from 19th c.",
          "references": []
        }
      ],
      "categories": [
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          "langcode": "en",
          "name": "Crystallography",
          "orig": "en:Crystallography",
          "parents": [],
          "source": "w"
        },
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          "kind": "other",
          "langcode": "en",
          "name": "Mineralogy",
          "orig": "en:Mineralogy",
          "parents": [],
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        }
      ],
      "glosses": [
        "The direction in which a ray of light passing through a crystal does not suffer double refraction."
      ],
      "id": "en-optic_axis-en-noun-cnT-SJgp",
      "links": [
        [
          "crystallography",
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          "mineralogy",
          "mineralogy"
        ],
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          "crystal",
          "crystal"
        ],
        [
          "refraction",
          "refraction"
        ]
      ],
      "raw_glosses": [
        "(crystallography, mineralogy) The direction in which a ray of light passing through a crystal does not suffer double refraction."
      ],
      "topics": [
        "chemistry",
        "crystallography",
        "geography",
        "geology",
        "mineralogy",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "optic axis"
}

{
  "categories": [
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    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries"
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  "forms": [
    {
      "form": "optic axes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "attestations": [
        {
          "date": "from 17th c.",
          "references": []
        }
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          "ref": "1665, Robert Hooke, Micrographia, section XXXIX:",
          "text": "[B]inocular creatures can in an instant […] move their eyes so as to direct the optick Axis to any point […].",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The optical axis."
      ],
      "links": [
        [
          "optical axis",
          "optical axis"
        ]
      ]
    },
    {
      "attestations": [
        {
          "date": "from 19th c.",
          "references": []
        }
      ],
      "categories": [
        "en:Crystallography",
        "en:Mineralogy"
      ],
      "glosses": [
        "The direction in which a ray of light passing through a crystal does not suffer double refraction."
      ],
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          "crystallography",
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        ],
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          "mineralogy",
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        ],
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        ]
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      "raw_glosses": [
        "(crystallography, mineralogy) The direction in which a ray of light passing through a crystal does not suffer double refraction."
      ],
      "topics": [
        "chemistry",
        "crystallography",
        "geography",
        "geology",
        "mineralogy",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "optic axis"
}