"Coolidge tube" meaning in English

{
  "etymology_text": "Introduced by William Coolidge in 1913.",
  "forms": [
    {
      "form": "Coolidge tubes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Coolidge tube (plural Coolidge tubes)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "An improvement on the Crookes tube in which the electrons are produced by thermionic effect from a tungsten filament heated by an electric current."
      ],
      "id": "en-Coolidge_tube-en-noun-sOf8VXXX",
      "links": [
        [
          "Crookes tube",
          "Crookes tube"
        ],
        [
          "electron",
          "electron"
        ],
        [
          "thermionic",
          "thermionic"
        ],
        [
          "tungsten",
          "tungsten"
        ],
        [
          "filament",
          "filament"
        ],
        [
          "electric current",
          "electric current"
        ]
      ],
      "synonyms": [
        {
          "word": "hot cathode tube"
        }
      ]
    }
  ],
  "word": "Coolidge tube"
}

{
  "etymology_text": "Introduced by William Coolidge in 1913.",
  "forms": [
    {
      "form": "Coolidge tubes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Coolidge tube (plural Coolidge tubes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "An improvement on the Crookes tube in which the electrons are produced by thermionic effect from a tungsten filament heated by an electric current."
      ],
      "links": [
        [
          "Crookes tube",
          "Crookes tube"
        ],
        [
          "electron",
          "electron"
        ],
        [
          "thermionic",
          "thermionic"
        ],
        [
          "tungsten",
          "tungsten"
        ],
        [
          "filament",
          "filament"
        ],
        [
          "electric current",
          "electric current"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "hot cathode tube"
    }
  ],
  "word": "Coolidge tube"
}