| adnoun |
| Definition: An adjective that is being used as a noun. |
| Example:
Make the rich pay.
(Here rich is an adnoun because it stands for rich people.) |
| OED: Its citation is from 1753: "Adnoun, Adnomen, or Adname, is used by some grammarians to express what we more usually call an adjective." (Chambers Cycl. Supp.) |