adnoun

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An adjective used as a noun, such as merciful in Blessed are the merciful.

from The Century Dictionary.

• noun In grammar, an adjective or attributive word; an adjunct to a noun; specifically, according to some grammarians, an adjective used substantively, as the good, the true, and the beautiful.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Gram.), rare An adjective, or attribute.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun grammar An adjective used as a noun.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an adjective used as a noun