| Word | Definitions | Synonyms |
|---|---|---|
| collagen | (noun) a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling | - |
| mutagen | (noun) any agent (physical or environmental) that can induce a genetic mutation or can increase the rate of mutation | - |
| tetragen | (noun) any chemical element that belongs to the carbon group. | Synonyms: carbon group element, crystallogen, Group 14 element, tetrel |