"birch bracket" meaning in English

{
  "forms": [
    {
      "form": "birch brackets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "birch bracket (plural birch brackets)",
      "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 Czech translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Finnish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Russian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Swedish translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Yakut translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Yakut terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Mushrooms",
          "orig": "en:Mushrooms",
          "parents": [
            "Fungi",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A polypore mushroom that grows almost exclusively on birch trees, Piptoporus betulinus."
      ],
      "id": "en-birch_bracket-en-noun-8YZw9428",
      "links": [
        [
          "mycology",
          "mycology"
        ],
        [
          "polypore",
          "polypore"
        ],
        [
          "Piptoporus betulinus",
          "Piptoporus betulinus#Translingual"
        ]
      ],
      "raw_glosses": [
        "(mycology) A polypore mushroom that grows almost exclusively on birch trees, Piptoporus betulinus."
      ],
      "synonyms": [
        {
          "word": "birch polypore"
        },
        {
          "word": "razor strop"
        }
      ],
      "topics": [
        "biology",
        "mycology",
        "natural-sciences"
      ],
      "translations": [
        {
          "code": "cs",
          "lang": "Czech",
          "sense": "Piptoporus betulinus",
          "word": "březovník obecný"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "Piptoporus betulinus",
          "word": "pökkelökääpä"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "trutovík berjózovyj",
          "sense": "Piptoporus betulinus",
          "tags": [
            "masculine"
          ],
          "word": "трутови́к берёзовый"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "Piptoporus betulinus",
          "tags": [
            "common-gender"
          ],
          "word": "björkticka"
        },
        {
          "code": "sah",
          "lang": "Yakut",
          "roman": "ıt munna",
          "sense": "Piptoporus betulinus",
          "word": "ыт мунна"
        }
      ]
    }
  ],
  "word": "birch bracket"
}

{
  "forms": [
    {
      "form": "birch brackets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "birch bracket (plural birch brackets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "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 Czech translations",
        "Terms with Finnish translations",
        "Terms with Russian translations",
        "Terms with Swedish translations",
        "Terms with Yakut translations",
        "Yakut terms with redundant script codes",
        "en:Mushrooms"
      ],
      "glosses": [
        "A polypore mushroom that grows almost exclusively on birch trees, Piptoporus betulinus."
      ],
      "links": [
        [
          "mycology",
          "mycology"
        ],
        [
          "polypore",
          "polypore"
        ],
        [
          "Piptoporus betulinus",
          "Piptoporus betulinus#Translingual"
        ]
      ],
      "raw_glosses": [
        "(mycology) A polypore mushroom that grows almost exclusively on birch trees, Piptoporus betulinus."
      ],
      "topics": [
        "biology",
        "mycology",
        "natural-sciences"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "birch polypore"
    },
    {
      "word": "razor strop"
    }
  ],
  "translations": [
    {
      "code": "cs",
      "lang": "Czech",
      "sense": "Piptoporus betulinus",
      "word": "březovník obecný"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "Piptoporus betulinus",
      "word": "pökkelökääpä"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "trutovík berjózovyj",
      "sense": "Piptoporus betulinus",
      "tags": [
        "masculine"
      ],
      "word": "трутови́к берёзовый"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "Piptoporus betulinus",
      "tags": [
        "common-gender"
      ],
      "word": "björkticka"
    },
    {
      "code": "sah",
      "lang": "Yakut",
      "roman": "ıt munna",
      "sense": "Piptoporus betulinus",
      "word": "ыт мунна"
    }
  ],
  "word": "birch bracket"
}