"coversine" meaning in English

{
  "forms": [
    {
      "form": "coversines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "coversine (plural coversines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Trigonometric functions",
          "orig": "en:Trigonometric functions",
          "parents": [
            "Circle",
            "Functions",
            "Trigonometry",
            "Curves",
            "Algebra",
            "Calculus",
            "Geometry",
            "Mathematical analysis",
            "Mathematics",
            "Shapes",
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            "Formal sciences",
            "Sciences",
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          "source": "w"
        }
      ],
      "glosses": [
        "The coversed sine."
      ],
      "id": "en-coversine-en-noun-6kF-aF-z",
      "links": [
        [
          "trigonometry",
          "trigonometry"
        ],
        [
          "coversed sine",
          "coversed sine"
        ]
      ],
      "raw_glosses": [
        "(trigonometry) The coversed sine."
      ],
      "related": [
        {
          "word": "haversine"
        },
        {
          "word": "vercosine"
        },
        {
          "word": "versine"
        }
      ],
      "topics": [
        "mathematics",
        "sciences",
        "trigonometry"
      ],
      "wikipedia": [
        "versine"
      ]
    }
  ],
  "word": "coversine"
}

{
  "forms": [
    {
      "form": "coversines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "coversine (plural coversines)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "haversine"
    },
    {
      "word": "vercosine"
    },
    {
      "word": "versine"
    }
  ],
  "senses": [
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      "glosses": [
        "The coversed sine."
      ],
      "links": [
        [
          "trigonometry",
          "trigonometry"
        ],
        [
          "coversed sine",
          "coversed sine"
        ]
      ],
      "raw_glosses": [
        "(trigonometry) The coversed sine."
      ],
      "topics": [
        "mathematics",
        "sciences",
        "trigonometry"
      ],
      "wikipedia": [
        "versine"
      ]
    }
  ],
  "word": "coversine"
}