"greengill" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "green",
        "3": "gill"
      },
      "expansion": "green + gill",
      "name": "compound"
    }
  ],
  "etymology_text": "From green + gill.",
  "forms": [
    {
      "form": "greengills",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "greengill (plural greengills)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Bivalves",
          "orig": "en:Bivalves",
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            "Mollusks",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
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          "source": "w"
        }
      ],
      "glosses": [
        "An oyster which has the gills tinged with a green pigment, formerly said to be due to an abnormal condition of the blood, but now proved to be due to the oyster's diet."
      ],
      "id": "en-greengill-en-noun-tH93q6kB",
      "links": [
        [
          "oyster",
          "oyster"
        ],
        [
          "gill",
          "gill"
        ],
        [
          "tinge",
          "tinge"
        ],
        [
          "green",
          "green"
        ],
        [
          "pigment",
          "pigment"
        ],
        [
          "abnormal",
          "abnormal"
        ],
        [
          "blood",
          "blood"
        ]
      ],
      "related": [
        {
          "word": "greengilled"
        }
      ]
    }
  ],
  "word": "greengill"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "green",
        "3": "gill"
      },
      "expansion": "green + gill",
      "name": "compound"
    }
  ],
  "etymology_text": "From green + gill.",
  "forms": [
    {
      "form": "greengills",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "greengill (plural greengills)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "greengilled"
    }
  ],
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      "glosses": [
        "An oyster which has the gills tinged with a green pigment, formerly said to be due to an abnormal condition of the blood, but now proved to be due to the oyster's diet."
      ],
      "links": [
        [
          "oyster",
          "oyster"
        ],
        [
          "gill",
          "gill"
        ],
        [
          "tinge",
          "tinge"
        ],
        [
          "green",
          "green"
        ],
        [
          "pigment",
          "pigment"
        ],
        [
          "abnormal",
          "abnormal"
        ],
        [
          "blood",
          "blood"
        ]
      ]
    }
  ],
  "word": "greengill"
}