"Secchi disk" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "it",
        "3": "Secchi"
      },
      "expansion": "Italian Secchi",
      "name": "der"
    }
  ],
  "etymology_text": "Secchi + disk. From Italian Secchi, from Angelo Secchi.",
  "forms": [
    {
      "form": "Secchi disks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Secchi disk (plural Secchi disks)",
      "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": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Italian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Measuring instruments",
          "orig": "en:Measuring instruments",
          "parents": [
            "Tools",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Optics",
          "orig": "en:Optics",
          "parents": [
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Water",
          "orig": "en:Water",
          "parents": [
            "Liquids",
            "Matter",
            "Chemistry",
            "Nature",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A circular disk used to measure water transparency (and thus turbidity)"
      ],
      "id": "en-Secchi_disk-en-noun-eT1-r805",
      "links": [
        [
          "circular",
          "circular"
        ],
        [
          "disk",
          "disk"
        ],
        [
          "water",
          "water"
        ],
        [
          "transparency",
          "transparency"
        ],
        [
          "turbidity",
          "turbidity"
        ]
      ],
      "related": [
        {
          "word": "Secchi depth"
        }
      ],
      "synonyms": [
        {
          "word": "Secchi disc"
        }
      ],
      "translations": [
        {
          "code": "it",
          "lang": "Italian",
          "sense": "Translations",
          "word": "disco Secchi"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "Translations",
          "word": "disco di Secchi"
        }
      ],
      "wikipedia": [
        "Secchi disk",
        "en:Angelo Secchi"
      ]
    }
  ],
  "word": "Secchi disk"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "it",
        "3": "Secchi"
      },
      "expansion": "Italian Secchi",
      "name": "der"
    }
  ],
  "etymology_text": "Secchi + disk. From Italian Secchi, from Angelo Secchi.",
  "forms": [
    {
      "form": "Secchi disks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Secchi disk (plural Secchi disks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "Secchi depth"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms derived from Italian",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Italian translations",
        "Translation table header lacks gloss",
        "en:Measuring instruments",
        "en:Optics",
        "en:Water"
      ],
      "glosses": [
        "A circular disk used to measure water transparency (and thus turbidity)"
      ],
      "links": [
        [
          "circular",
          "circular"
        ],
        [
          "disk",
          "disk"
        ],
        [
          "water",
          "water"
        ],
        [
          "transparency",
          "transparency"
        ],
        [
          "turbidity",
          "turbidity"
        ]
      ],
      "wikipedia": [
        "Secchi disk",
        "en:Angelo Secchi"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Secchi disc"
    }
  ],
  "translations": [
    {
      "code": "it",
      "lang": "Italian",
      "sense": "Translations",
      "word": "disco Secchi"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "Translations",
      "word": "disco di Secchi"
    }
  ],
  "word": "Secchi disk"
}