Definition of antonomastically in English:

antonomastically

Pronunciation /ˌantənəˈmastɪkli/

adverb

  • In an antonomastic manner; by means of antonomasia.

Origin

Early 17th century; earliest use found in Thomas Morton. From post-classical Latin antonomastice (adverb) by use of an epithet as a proper name, by specialized use + -ally.