| Dramatic opening? |
| Aircraft opening? |
| Cellular opening? |
| Chamber opening? |
| A recent opening? |
| Adjusted opening? |
| High opening? |
| Age opening? |
| Carbon dioxide or water vis-à-vis cellular respiration |
| Dextrous opening? |
| Lock opening? |
| Bell opening? (and this puzzle's theme spelled out) |
| Slight opening? |
| Steven's opening? |
| Store opening? |
| Physical opening? |
| Dome opening? |
| Milk-lover's letter opening? |
| Unicellular swimmers |
| Checkers opening? |
| Biographical opening? |
| Stomach opening? |
| Zipper opening? |
| Story's opening? |
| Toledo opening? |
| Spheric opening? |
| Opening opening? |
| Silver opening? |
| Oratory opening? |
| Dermal opening? |