"gnathotheca" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "gnatho",
        "3": "theca"
      },
      "expansion": "gnatho- + theca",
      "name": "prefix"
    }
  ],
  "etymology_text": "From gnatho- + theca.",
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "gnathotheca",
      "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": "English terms prefixed with gnatho-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Animal body parts",
          "orig": "en:Animal body parts",
          "parents": [
            "Body parts",
            "Animals",
            "Body",
            "Anatomy",
            "Lifeforms",
            "All topics",
            "Biology",
            "Medicine",
            "Life",
            "Fundamental",
            "Sciences",
            "Healthcare",
            "Nature",
            "Health"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The horny covering of the lower part of a bird's beak."
      ],
      "id": "en-gnathotheca-en-noun-VPrjIxTj",
      "links": [
        [
          "horny",
          "horny"
        ],
        [
          "covering",
          "covering"
        ],
        [
          "beak",
          "beak"
        ]
      ]
    }
  ],
  "word": "gnathotheca"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "gnatho",
        "3": "theca"
      },
      "expansion": "gnatho- + theca",
      "name": "prefix"
    }
  ],
  "etymology_text": "From gnatho- + theca.",
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "gnathotheca",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English terms prefixed with gnatho-",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Animal body parts"
      ],
      "glosses": [
        "The horny covering of the lower part of a bird's beak."
      ],
      "links": [
        [
          "horny",
          "horny"
        ],
        [
          "covering",
          "covering"
        ],
        [
          "beak",
          "beak"
        ]
      ]
    }
  ],
  "word": "gnathotheca"
}