| Noun | 1. | Merlin - (Arthurian legend) the magician who acted as King Arthur's advisorArthurian legend - the legend of King Arthur and his court at Camelot |
| 2. | merlin - small falcon of Europe and America having dark plumage with black-barred tail; used in falconryfalcon - diurnal birds of prey having long pointed powerful wings adapted for swift flight Falco, genus Falco - a genus of Falconidae |