"birthday book" meaning in English

{
  "forms": [
    {
      "form": "birthday books",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "birthday book (plural birthday books)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A book, in diary form, in which one's friends enter their birthdates in their own handwriting."
      ],
      "id": "en-birthday_book-en-noun-ziK5LQCC",
      "links": [
        [
          "diary",
          "diary"
        ],
        [
          "friend",
          "friend"
        ],
        [
          "birthdate",
          "birthdate"
        ],
        [
          "handwriting",
          "handwriting"
        ]
      ],
      "raw_glosses": [
        "(historical) A book, in diary form, in which one's friends enter their birthdates in their own handwriting."
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "word": "birthday book"
}

{
  "forms": [
    {
      "form": "birthday books",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "birthday book (plural birthday books)",
      "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",
        "English terms with historical senses",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A book, in diary form, in which one's friends enter their birthdates in their own handwriting."
      ],
      "links": [
        [
          "diary",
          "diary"
        ],
        [
          "friend",
          "friend"
        ],
        [
          "birthdate",
          "birthdate"
        ],
        [
          "handwriting",
          "handwriting"
        ]
      ],
      "raw_glosses": [
        "(historical) A book, in diary form, in which one's friends enter their birthdates in their own handwriting."
      ],
      "tags": [
        "historical"
      ]
    }
  ],
  "word": "birthday book"
}