| Main Entry: | |
| Part of Speech: | noun |
| Definition: | keystone |
| Synonyms: | angle, cornerstone, wedge |
| Main Entry: | wedge |
| Part of Speech: | noun |
| Definition: | solid piece, often triangular |
| Synonyms: | block, chock, chunk, cleat, cotter, cusp, keystone, lump, prong, quoin, shim, spire, taper |
| Antonyms: | whole |