black-letter
noun
Definitions
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.
Text set in black-letter type.
The basic standard elements for a particular field of law, which are generally known and free from doubt or dispute.
noun
Definitions
Written or printed in black letter.
Example: a black-letter manuscript or book
Given to the study of books in black letter; old-fashioned.
Of or relating to the days in the calendar not marked with red letters as saints' days; unlucky; inauspicious.