ballon d'essai (bæˈlõ dɛˈseɪ) ![]() | |
| —n , pl ballons d'essai | |
| Compare trial balloon a project or policy put forward experimentally to gauge reactions to it | |
| [C19: from French, literally: trial balloon] | |
| the offspring of a zebra and a donkey. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |