black-letter

/B L AE1 K L EH1 T ER0/
noun
  1. 1

    A Northern European style of type, with contrasting thick-and-thin, angular strokes forming upright letterforms, and usually set with a dark typographic colour on the page.

  2. 2

    Text set in black-letter type.

  3. 3

    The basic standard elements for a particular field of law, which are generally known and free from doubt or dispute.

Synonyms

noun
  1. 1

    Written or printed in black letter.

    a black-letter manuscript or book

  2. 2

    Given to the study of books in black letter; old-fashioned.

  3. 3

    Of or relating to the days in the calendar not marked with red letters as saints' days; unlucky; inauspicious.

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Source: https://en.wiktionary.org/wiki/black%20letter, https://en.wiktionary.org/wiki/black-letter