What is "adnominal"

Adnominal \Ad*nom"i*nal\, a. [L. ad + nomen noun.] (Gram.) Pertaining to an adnoun; adjectival; attached to a noun.
--Gibbs. -- Ad*nom"i*nal*ly, adv.

Etymology 1 a. Of or pertaining to an adnoun Etymology 2

n. a word or phrase qualifying a noun, such as an adjective and a relative clause