Pronunciation: (prō-nom'u-nl),[key] —adj. 1. Gram.pertaining to, resembling, derived from, or containing a pronoun: “My” in “my book” is a pronominal adjective. “There” is a pronominal adverb. 2. Heraldry.noting the coat of arms on a quartered escutcheon: customarily occupying the first quarter and being the original coat of arms of the paternal line.