"thunder-drum" meaning in English

{
  "forms": [
    {
      "form": "thunder-drums",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "thunder-drum (plural thunder-drums)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "1920, Edward Carpenter, Pagan and Christian Creeds, New York: Harcourt, Brace and Co., published 1921, page 72",
          "text": "Bull-voices and thunder-drums and the clashing of cymbals were used in this connection by the Greeks, and are mentioned by Aeschylus; but the bull-roarer, in the form of a rhombus of wood whirled at the end of a string, seems to be known, or to have been known, all over the world.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A large drum giving a deep booming sound when struck, used to imitate the sound of thunder."
      ],
      "id": "en-thunder-drum-en-noun-UwCHAZm9",
      "links": [
        [
          "struck",
          "strike"
        ],
        [
          "imitate",
          "imitate"
        ]
      ]
    }
  ],
  "word": "thunder-drum"
}

{
  "forms": [
    {
      "form": "thunder-drums",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "thunder-drum (plural thunder-drums)",
      "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 terms with quotations"
      ],
      "examples": [
        {
          "ref": "1920, Edward Carpenter, Pagan and Christian Creeds, New York: Harcourt, Brace and Co., published 1921, page 72",
          "text": "Bull-voices and thunder-drums and the clashing of cymbals were used in this connection by the Greeks, and are mentioned by Aeschylus; but the bull-roarer, in the form of a rhombus of wood whirled at the end of a string, seems to be known, or to have been known, all over the world.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A large drum giving a deep booming sound when struck, used to imitate the sound of thunder."
      ],
      "links": [
        [
          "struck",
          "strike"
        ],
        [
          "imitate",
          "imitate"
        ]
      ]
    }
  ],
  "word": "thunder-drum"
}