"periaqueductal gray" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "periaqueductal"
      },
      "expansion": "periaqueductal",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "gray matter"
      },
      "expansion": "gray matter",
      "name": "m"
    }
  ],
  "etymology_text": "Shortening of periaqueductal gray matter.",
  "head_templates": [
    {
      "args": {
        "1": "!"
      },
      "expansion": "periaqueductal gray (plural not attested)",
      "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",
          "name": "English nouns with unattested plurals",
          "parents": [
            "Nouns with unattested plurals",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Neuroanatomy",
          "orig": "en:Neuroanatomy",
          "parents": [
            "Anatomy",
            "Neurology",
            "Neuroscience",
            "Biology",
            "Medicine",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2011, Steven Pinker, The Better Angels of Our Nature, Penguin, published 2012, page 601",
          "text": "The periaqueductal gray contains circuits that control the sensorimotor components of rage.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The region surrounding the cerebral aqueduct in the midbrain, playing an important role in analgesia."
      ],
      "id": "en-periaqueductal_gray-en-noun-ipbOFjJG",
      "links": [
        [
          "neuroanatomy",
          "neuroanatomy"
        ],
        [
          "cerebral aqueduct",
          "cerebral aqueduct"
        ],
        [
          "midbrain",
          "midbrain"
        ],
        [
          "analgesia",
          "analgesia"
        ]
      ],
      "raw_glosses": [
        "(neuroanatomy) The region surrounding the cerebral aqueduct in the midbrain, playing an important role in analgesia."
      ],
      "synonyms": [
        {
          "word": "central gray"
        },
        {
          "word": "PAG"
        },
        {
          "word": "periaqueductal grey"
        }
      ],
      "tags": [
        "no-plural"
      ],
      "topics": [
        "anatomy",
        "medicine",
        "neuroanatomy",
        "neurology",
        "neuroscience",
        "sciences"
      ],
      "wikipedia": [
        "periaqueductal gray"
      ]
    }
  ],
  "word": "periaqueductal gray"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "periaqueductal"
      },
      "expansion": "periaqueductal",
      "name": "m"
    },
    {
      "args": {
        "1": "en",
        "2": "gray matter"
      },
      "expansion": "gray matter",
      "name": "m"
    }
  ],
  "etymology_text": "Shortening of periaqueductal gray matter.",
  "head_templates": [
    {
      "args": {
        "1": "!"
      },
      "expansion": "periaqueductal gray (plural not attested)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English nouns with unattested plurals",
        "English terms with quotations",
        "Quotation templates to be cleaned",
        "en:Neuroanatomy"
      ],
      "examples": [
        {
          "ref": "2011, Steven Pinker, The Better Angels of Our Nature, Penguin, published 2012, page 601",
          "text": "The periaqueductal gray contains circuits that control the sensorimotor components of rage.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "The region surrounding the cerebral aqueduct in the midbrain, playing an important role in analgesia."
      ],
      "links": [
        [
          "neuroanatomy",
          "neuroanatomy"
        ],
        [
          "cerebral aqueduct",
          "cerebral aqueduct"
        ],
        [
          "midbrain",
          "midbrain"
        ],
        [
          "analgesia",
          "analgesia"
        ]
      ],
      "raw_glosses": [
        "(neuroanatomy) The region surrounding the cerebral aqueduct in the midbrain, playing an important role in analgesia."
      ],
      "synonyms": [
        {
          "word": "central gray"
        },
        {
          "word": "PAG"
        }
      ],
      "tags": [
        "no-plural"
      ],
      "topics": [
        "anatomy",
        "medicine",
        "neuroanatomy",
        "neurology",
        "neuroscience",
        "sciences"
      ],
      "wikipedia": [
        "periaqueductal gray"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "periaqueductal grey"
    }
  ],
  "word": "periaqueductal gray"
}