"topophone" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "topo",
        "3": "phone"
      },
      "expansion": "topo- + -phone",
      "name": "confix"
    }
  ],
  "etymology_text": "topo- + -phone",
  "forms": [
    {
      "form": "topophones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "topophone (plural topophones)",
      "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 terms prefixed with topo-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -phone",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A double ear trumpet for estimating the direction from which sounds proceed, formerly used by navigators."
      ],
      "id": "en-topophone-en-noun-vEXKR3xC",
      "links": [
        [
          "double",
          "double"
        ],
        [
          "ear trumpet",
          "ear trumpet"
        ],
        [
          "direction",
          "direction"
        ],
        [
          "sound",
          "sound"
        ],
        [
          "navigator",
          "navigator"
        ]
      ]
    }
  ],
  "word": "topophone"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "topo",
        "3": "phone"
      },
      "expansion": "topo- + -phone",
      "name": "confix"
    }
  ],
  "etymology_text": "topo- + -phone",
  "forms": [
    {
      "form": "topophones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "topophone (plural topophones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with topo-",
        "English terms suffixed with -phone"
      ],
      "glosses": [
        "A double ear trumpet for estimating the direction from which sounds proceed, formerly used by navigators."
      ],
      "links": [
        [
          "double",
          "double"
        ],
        [
          "ear trumpet",
          "ear trumpet"
        ],
        [
          "direction",
          "direction"
        ],
        [
          "sound",
          "sound"
        ],
        [
          "navigator",
          "navigator"
        ]
      ]
    }
  ],
  "word": "topophone"
}