"headbox" meaning in English

{
  "etymology_templates": [
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        "2": "head",
        "3": "box"
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      "expansion": "head + box",
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  ],
  "etymology_text": "From head + box.",
  "forms": [
    {
      "form": "headboxes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "headbox (plural headboxes)",
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  "lang_code": "en",
  "pos": "noun",
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          "_dis": "11 41 49",
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          "name": "Entries with translation boxes",
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      "glosses": [
        "Synonym of headrail."
      ],
      "id": "en-headbox-en-noun-9RT6TUzh",
      "links": [
        [
          "headrail",
          "headrail#English"
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          "word": "headrail"
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      ],
      "glosses": [
        "A device for distributing a suspension of solids in water to a machine at a constant rate, or for retarding the rate of flow, as to a top-feed filter, or for eliminating by overflow some of the finest particles."
      ],
      "id": "en-headbox-en-noun-0Z2HbYt1",
      "links": [
        [
          "suspension",
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          "solid",
          "solid"
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          "water",
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        [
          "retard",
          "retard"
        ],
        [
          "top-feed",
          "top-feed"
        ],
        [
          "filter",
          "filter"
        ]
      ]
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      ],
      "glosses": [
        "The topmost square of a USPSA target holding the B and A scoring zones."
      ],
      "id": "en-headbox-en-noun-Buwt9yIM",
      "translations": [
        {
          "_dis1": "0 0 100",
          "code": "fi",
          "lang": "Finnish",
          "lang_code": "fi",
          "sense": "part of USPSA target",
          "word": "yläneliö"
        }
      ]
    }
  ],
  "word": "headbox"
}

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  ],
  "etymology_text": "From head + box.",
  "forms": [
    {
      "form": "headboxes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "expansion": "headbox (plural headboxes)",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "glosses": [
        "Synonym of headrail."
      ],
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          "word": "headrail"
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    },
    {
      "glosses": [
        "A device for distributing a suspension of solids in water to a machine at a constant rate, or for retarding the rate of flow, as to a top-feed filter, or for eliminating by overflow some of the finest particles."
      ],
      "links": [
        [
          "suspension",
          "suspension"
        ],
        [
          "solid",
          "solid"
        ],
        [
          "water",
          "water"
        ],
        [
          "retard",
          "retard"
        ],
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          "top-feed",
          "top-feed"
        ],
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          "filter",
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        ]
      ]
    },
    {
      "glosses": [
        "The topmost square of a USPSA target holding the B and A scoring zones."
      ]
    }
  ],
  "translations": [
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      "lang_code": "fi",
      "sense": "part of USPSA target",
      "word": "yläneliö"
    }
  ],
  "word": "headbox"
}