"immersion oil" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Microscopy",
          "orig": "en:Microscopy",
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      "glosses": [
        "A transparent oil of a specific refractive index and viscosity used to increase the resolving power of a microscope by filling the gap between the objective lens and the specimen."
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      "id": "en-immersion_oil-en-noun-yX8QMU1B",
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        [
          "microscopy",
          "microscopy"
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        [
          "refractive index",
          "refractive index"
        ],
        [
          "viscosity",
          "viscosity"
        ],
        [
          "resolving power",
          "resolving power"
        ],
        [
          "objective lens",
          "objective lens"
        ],
        [
          "specimen",
          "specimen"
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      "qualifier": "microscopy",
      "raw_glosses": [
        "(microscopy) A transparent oil of a specific refractive index and viscosity used to increase the resolving power of a microscope by filling the gap between the objective lens and the specimen."
      ]
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  "word": "immersion oil"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "A transparent oil of a specific refractive index and viscosity used to increase the resolving power of a microscope by filling the gap between the objective lens and the specimen."
      ],
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        [
          "microscopy",
          "microscopy"
        ],
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          "refractive index",
          "refractive index"
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          "viscosity",
          "viscosity"
        ],
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          "resolving power",
          "resolving power"
        ],
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          "objective lens",
          "objective lens"
        ],
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          "specimen",
          "specimen"
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      "qualifier": "microscopy",
      "raw_glosses": [
        "(microscopy) A transparent oil of a specific refractive index and viscosity used to increase the resolving power of a microscope by filling the gap between the objective lens and the specimen."
      ]
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  "word": "immersion oil"
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