[mod. f. L. ad to + NOUN, on the model of adverb. Also in mod.Fr. adnom, and mod.L. adnōmen; the cl. L. adnōmen, var. of agnōmen, had a different sense.] A word added or joined to a noun substantive, an adjective; spec. used by some grammarians for an adjective used substantively.
1753. Chambers, Cycl. Supp., Adnoun, Adnomen, or Adname, is used by some grammarians to express what we more usually call an adjective.
a. 1834. Coleridge, Notes Theol. & Polit., 401. The modification of the noun by the verb is the Adnoun or Adjective.
1876. Bancroft, Hist. U.S., II. xxxvi. 415. The verb, says Elliot, is thus changed to an adnoun.
