"grey goo" meaning in English

{
  "etymology_text": "Coined by Eric Drexler in his 1986 book Engines of Creation.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "grey goo (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Eschatology",
          "orig": "en:Eschatology",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Fictional materials",
          "orig": "en:Fictional materials",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Nanotechnology",
          "orig": "en:Nanotechnology",
          "parents": [
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Robotics",
          "orig": "en:Robotics",
          "parents": [
            "Engineering",
            "Applied sciences",
            "Technology",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Science fiction",
          "orig": "en:Science fiction",
          "parents": [
            "Fiction",
            "Speculative fiction",
            "Artistic works",
            "Genres",
            "Art",
            "Entertainment",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A hypothetical end-of-the-world event involving nanotechnology, in which out-of-control self-replicating nanobots consume all life on Earth."
      ],
      "id": "en-grey_goo-en-noun-9Ho3-~iu",
      "links": [
        [
          "hypothetical",
          "hypothetical"
        ],
        [
          "end-of-the-world",
          "end of the world"
        ],
        [
          "event",
          "event"
        ],
        [
          "nanotechnology",
          "nanotechnology"
        ],
        [
          "out-of-control",
          "out of control"
        ],
        [
          "self-replicating",
          "self-replicating"
        ],
        [
          "nanobot",
          "nanobot"
        ],
        [
          "life",
          "life"
        ],
        [
          "Earth",
          "Earth"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "US"
          ],
          "word": "gray goo"
        }
      ],
      "tags": [
        "uncountable"
      ],
      "wikipedia": [
        "Engines of Creation",
        "grey goo"
      ]
    }
  ],
  "word": "grey goo"
}

{
  "etymology_text": "Coined by Eric Drexler in his 1986 book Engines of Creation.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "grey goo (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns",
        "en:Eschatology",
        "en:Fictional materials",
        "en:Nanotechnology",
        "en:Robotics",
        "en:Science fiction"
      ],
      "glosses": [
        "A hypothetical end-of-the-world event involving nanotechnology, in which out-of-control self-replicating nanobots consume all life on Earth."
      ],
      "links": [
        [
          "hypothetical",
          "hypothetical"
        ],
        [
          "end-of-the-world",
          "end of the world"
        ],
        [
          "event",
          "event"
        ],
        [
          "nanotechnology",
          "nanotechnology"
        ],
        [
          "out-of-control",
          "out of control"
        ],
        [
          "self-replicating",
          "self-replicating"
        ],
        [
          "nanobot",
          "nanobot"
        ],
        [
          "life",
          "life"
        ],
        [
          "Earth",
          "Earth"
        ]
      ],
      "tags": [
        "uncountable"
      ],
      "wikipedia": [
        "Engines of Creation",
        "grey goo"
      ]
    }
  ],
  "synonyms": [
    {
      "tags": [
        "US"
      ],
      "word": "gray goo"
    }
  ],
  "word": "grey goo"
}