"rock varnish" meaning in English

{
  "forms": [
    {
      "form": "rock varnishes",
      "tags": [
        "plural"
      ]
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      "expansion": "rock varnish (countable and uncountable, plural rock varnishes)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Rocks",
          "orig": "en:Rocks",
          "parents": [
            "Geology",
            "Natural materials",
            "Earth sciences",
            "Materials",
            "Nature",
            "Sciences",
            "Manufacturing",
            "All topics",
            "Human activity",
            "Fundamental",
            "Human behaviour",
            "Human"
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          "source": "w"
        }
      ],
      "glosses": [
        "A dark coating on rock surfaces exposed to the atmosphere, mostly comprising clay and oxides, which grows at only a few micrometers per thousand years; found especially in arid deserts."
      ],
      "id": "en-rock_varnish-en-noun-2k-PpM8u",
      "links": [
        [
          "coating",
          "coating"
        ],
        [
          "surface",
          "surface"
        ],
        [
          "atmosphere",
          "atmosphere"
        ],
        [
          "clay",
          "clay"
        ],
        [
          "oxide",
          "oxide"
        ],
        [
          "micrometer",
          "micrometer"
        ],
        [
          "thousand",
          "thousand"
        ],
        [
          "year",
          "year"
        ],
        [
          "arid",
          "arid"
        ],
        [
          "desert",
          "desert"
        ]
      ],
      "synonyms": [
        {
          "word": "desert varnish"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "wikipedia": [
        "rock varnish"
      ]
    }
  ],
  "word": "rock varnish"
}

{
  "forms": [
    {
      "form": "rock varnishes",
      "tags": [
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "A dark coating on rock surfaces exposed to the atmosphere, mostly comprising clay and oxides, which grows at only a few micrometers per thousand years; found especially in arid deserts."
      ],
      "links": [
        [
          "coating",
          "coating"
        ],
        [
          "surface",
          "surface"
        ],
        [
          "atmosphere",
          "atmosphere"
        ],
        [
          "clay",
          "clay"
        ],
        [
          "oxide",
          "oxide"
        ],
        [
          "micrometer",
          "micrometer"
        ],
        [
          "thousand",
          "thousand"
        ],
        [
          "year",
          "year"
        ],
        [
          "arid",
          "arid"
        ],
        [
          "desert",
          "desert"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "wikipedia": [
        "rock varnish"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "desert varnish"
    }
  ],
  "word": "rock varnish"
}