"taffrail log" meaning in English

{
  "forms": [
    {
      "form": "taffrail logs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "taffrail log (plural taffrail logs)",
      "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 Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Hebrew translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Russian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Nautical",
          "orig": "en:Nautical",
          "parents": [
            "Transport",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water; usually consists of a propeller, a reading unit and a stiff line connecting them."
      ],
      "id": "en-taffrail_log-en-noun-XFmJf0qR",
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "stern",
          "stern"
        ]
      ],
      "raw_glosses": [
        "(nautical) A mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water; usually consists of a propeller, a reading unit and a stiff line connecting them."
      ],
      "related": [
        {
          "word": "chip log"
        }
      ],
      "synonyms": [
        {
          "word": "patent log"
        }
      ],
      "topics": [
        "nautical",
        "transport"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "nautical speed measuring device",
          "word": "laahusloki"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "nautical speed measuring device",
          "word": "patenttiloki"
        },
        {
          "code": "he",
          "lang": "Hebrew",
          "roman": "log patenti",
          "sense": "nautical speed measuring device",
          "tags": [
            "masculine"
          ],
          "word": "לוֹג פָּטֶנְטִי"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "vertušečnyj lag",
          "sense": "nautical speed measuring device",
          "word": "вертушечный лаг"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "gakabortnyj buksirujemyj lag",
          "sense": "nautical speed measuring device",
          "word": "гакабортный буксируемый лаг"
        }
      ]
    }
  ],
  "word": "taffrail log"
}

{
  "forms": [
    {
      "form": "taffrail logs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "taffrail log (plural taffrail logs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "chip log"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Finnish translations",
        "Terms with Hebrew translations",
        "Terms with Russian translations",
        "en:Nautical"
      ],
      "glosses": [
        "A mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water; usually consists of a propeller, a reading unit and a stiff line connecting them."
      ],
      "links": [
        [
          "nautical",
          "nautical"
        ],
        [
          "stern",
          "stern"
        ]
      ],
      "raw_glosses": [
        "(nautical) A mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water; usually consists of a propeller, a reading unit and a stiff line connecting them."
      ],
      "topics": [
        "nautical",
        "transport"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "patent log"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "nautical speed measuring device",
      "word": "laahusloki"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "nautical speed measuring device",
      "word": "patenttiloki"
    },
    {
      "code": "he",
      "lang": "Hebrew",
      "roman": "log patenti",
      "sense": "nautical speed measuring device",
      "tags": [
        "masculine"
      ],
      "word": "לוֹג פָּטֶנְטִי"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "vertušečnyj lag",
      "sense": "nautical speed measuring device",
      "word": "вертушечный лаг"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "gakabortnyj buksirujemyj lag",
      "sense": "nautical speed measuring device",
      "word": "гакабортный буксируемый лаг"
    }
  ],
  "word": "taffrail log"
}