"black-letter" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "adjective",
        "head": "black-letter"
      },
      "expansion": "black-letter",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Printing",
          "orig": "en:Printing",
          "parents": [
            "Industries",
            "Business",
            "Economics",
            "Society",
            "Social sciences",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "a black-letter manuscript or book",
          "type": "example"
        },
        {
          "ref": "1880, William Blades, The Enemies of Books, page 54",
          "text": "In the summer of 1877, a gentleman with whom I was well acquainted, took lodgings in Preston-street, Brighton. The morning after his arrival, he found in the W.C. some leaves of an old black-letter book.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Written or printed in black letter."
      ],
      "id": "en-black-letter-en-adj-xA2OzsDt",
      "links": [
        [
          "printing",
          "printing#Noun"
        ],
        [
          "black letter",
          "black letter"
        ]
      ],
      "raw_glosses": [
        "(printing) Written or printed in black letter."
      ],
      "topics": [
        "media",
        "printing",
        "publishing"
      ]
    },
    {
      "categories": [
        {
          "_dis": "4 52 44",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1833, James Boaden, Memoirs of Mrs. Inchbald",
          "text": "Kemble, a black-letter man!",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Given to the study of books in black letter; old-fashioned."
      ],
      "id": "en-black-letter-en-adj-WHYHKmmM",
      "links": [
        [
          "black letter",
          "black letter"
        ],
        [
          "old-fashioned",
          "old-fashioned"
        ]
      ],
      "raw_glosses": [
        "(figurative) Given to the study of books in black letter; old-fashioned."
      ],
      "tags": [
        "figuratively"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "English terms with collocations",
          "parents": [
            "Terms with collocations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "_dis": "4 52 44",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "black-letter days",
          "type": "example"
        }
      ],
      "glosses": [
        "Of or relating to the days in the calendar not marked with red letters as saints' days; unlucky; inauspicious."
      ],
      "id": "en-black-letter-en-adj-rVme43mW",
      "links": [
        [
          "calendar",
          "calendar"
        ],
        [
          "unlucky",
          "unlucky"
        ],
        [
          "inauspicious",
          "inauspicious"
        ]
      ]
    }
  ],
  "word": "black-letter"
}

{
  "categories": [
    "English adjectives",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms"
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "adjective",
        "head": "black-letter"
      },
      "expansion": "black-letter",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English terms with quotations",
        "English terms with usage examples",
        "en:Printing"
      ],
      "examples": [
        {
          "text": "a black-letter manuscript or book",
          "type": "example"
        },
        {
          "ref": "1880, William Blades, The Enemies of Books, page 54",
          "text": "In the summer of 1877, a gentleman with whom I was well acquainted, took lodgings in Preston-street, Brighton. The morning after his arrival, he found in the W.C. some leaves of an old black-letter book.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Written or printed in black letter."
      ],
      "links": [
        [
          "printing",
          "printing#Noun"
        ],
        [
          "black letter",
          "black letter"
        ]
      ],
      "raw_glosses": [
        "(printing) Written or printed in black letter."
      ],
      "topics": [
        "media",
        "printing",
        "publishing"
      ]
    },
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1833, James Boaden, Memoirs of Mrs. Inchbald",
          "text": "Kemble, a black-letter man!",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Given to the study of books in black letter; old-fashioned."
      ],
      "links": [
        [
          "black letter",
          "black letter"
        ],
        [
          "old-fashioned",
          "old-fashioned"
        ]
      ],
      "raw_glosses": [
        "(figurative) Given to the study of books in black letter; old-fashioned."
      ],
      "tags": [
        "figuratively"
      ]
    },
    {
      "categories": [
        "English terms with collocations"
      ],
      "examples": [
        {
          "text": "black-letter days",
          "type": "example"
        }
      ],
      "glosses": [
        "Of or relating to the days in the calendar not marked with red letters as saints' days; unlucky; inauspicious."
      ],
      "links": [
        [
          "calendar",
          "calendar"
        ],
        [
          "unlucky",
          "unlucky"
        ],
        [
          "inauspicious",
          "inauspicious"
        ]
      ]
    }
  ],
  "word": "black-letter"
}