| yellow jack | |
| —n | |
| 1. | pathol another name for yellow fever |
| 2. | another name for quarantine flag |
| 3. | any of certain large yellowish carangid food fishes, esp Caranx bartholomaei, of warm and tropical Atlantic waters |
| a chattering or flighty, light-headed person. |
| a fool or simpleton; ninny. |