noun, plural -keys, adjective | 1. | the domestic ass, Equus asinus. |
| 2. | (since 1874) a representation of this animal as the emblem of the U.S. Democratic party. |
| 3. | a stupid, silly, or obstinate person. |
| 4. | a woodworking apparatus consisting of a clamping frame and saw, used for cutting marquetry veneers. |
| 5. | Machinery. auxiliary: donkey engine; donkey pump; donkey boiler. |

A symbol of the Democratic party, introduced in a series of political cartoons by Thomas Nast during the congressional elections of 1874. (Compare elephant.)