Definition of bold noun from the Oxford Advanced Learner's Dictionary

 

bold

 noun
noun
BrE BrE//bəʊld//
 
; NAmE NAmE//boʊld//
 
 
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(also boldface
BrE BrE//ˈbəʊldfeɪs//
 
; NAmE NAmE//ˈboʊldfeɪs//
 
)
[uncountable] (specialist) thick, dark type used for printing words or letters Headwords are printed in bold.
Word Origin Old English bald, of Germanic origin; related to Dutch boud and to German bald ‘soon’.
See the Oxford Advanced American Dictionary entry: bold