| Noun | 1. | sphinx - an inscrutable person who keeps his thoughts and intentions secret | |
| 2. | Sphinx - (Greek mythology) a riddling winged monster with a woman's head and breast on a lion's body; daughter of Typhon | |
| 3. | sphinx - one of a number of large stone statues with the body of a lion and the head of a man that were built by the ancient Egyptiansstatue - a sculpture representing a human or animal | |