"materia gris" meaning in All languages combined

{
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "-"
      },
      "expansion": "materia gris f (uncountable)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "es",
          "name": "Brain",
          "orig": "es:Brain",
          "parents": [
            "Body",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "grey matter"
      ],
      "id": "en-materia_gris-es-noun-tgx8sLhY",
      "links": [
        [
          "grey matter",
          "grey matter"
        ]
      ],
      "tags": [
        "feminine",
        "uncountable"
      ]
    }
  ],
  "word": "materia gris"
}

{
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "-"
      },
      "expansion": "materia gris f (uncountable)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Spanish entries with incorrect language header",
        "Spanish feminine nouns",
        "Spanish lemmas",
        "Spanish multiword terms",
        "Spanish nouns",
        "Spanish uncountable nouns",
        "es:Brain"
      ],
      "glosses": [
        "grey matter"
      ],
      "links": [
        [
          "grey matter",
          "grey matter"
        ]
      ],
      "tags": [
        "feminine",
        "uncountable"
      ]
    }
  ],
  "word": "materia gris"
}