| Answer | Crossword Clue |
|---|---|
| SINUS | Air-filled skull cavity |
| SINUS | Air cavity in the skull. |
| utricle | small sac or baglike body, as an air-filled cavity in a seaweed |
| utricles | small sac or baglike body, as an air-filled cavity in a seaweed |
| bubbles | An air- or gas-filled spherical cavity in a liquid or a solidified liquid such as glass or amber |
| bubble | An air- or gas-filled spherical cavity in a liquid or a solidified liquid such as glass or amber |
