| Answer | Crossword Clue |
|---|---|
| OXIDES | Compounds in rust, etc. |
| OXIDES | Rust compounds |
| rust | (of metal pipes, machinery, etc.) to decay and become unusable through the action of rust |
| proteose | any of a class of soluble compounds derived from proteins by the action of the gastric juices, pancreatic juices, etc. |
