"photopion" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "photo",
        "3": "pion"
      },
      "expansion": "photo- + pion",
      "name": "prefix"
    }
  ],
  "etymology_text": "photo- + pion",
  "forms": [
    {
      "form": "photopions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "photopion (plural photopions)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with photo-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A pion generated by the action of light"
      ],
      "id": "en-photopion-en-noun-NQ8JVGSG",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "pion",
          "pion"
        ],
        [
          "light",
          "light"
        ]
      ],
      "raw_glosses": [
        "(physics) A pion generated by the action of light"
      ],
      "related": [
        {
          "word": "photoelectron"
        }
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "photopion"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "photo",
        "3": "pion"
      },
      "expansion": "photo- + pion",
      "name": "prefix"
    }
  ],
  "etymology_text": "photo- + pion",
  "forms": [
    {
      "form": "photopions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "photopion (plural photopions)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "photoelectron"
    }
  ],
  "senses": [
    {
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        "English entries with incorrect language header",
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        "English nouns",
        "English terms prefixed with photo-",
        "en:Physics"
      ],
      "glosses": [
        "A pion generated by the action of light"
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "pion",
          "pion"
        ],
        [
          "light",
          "light"
        ]
      ],
      "raw_glosses": [
        "(physics) A pion generated by the action of light"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "photopion"
}