| All A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
| X-Base | A crossed frame supporting a table, chair, or bench that spans diagonally from both sides. |
| X-Chair | An 'X' shaped folding chair. X-chairs date back to ancient Egypt, Rome and the Middle Ages. |
| Xenon | An elemental gas used in flash lamps and arc lamps. |
| X-Stretcher | A crossed stretcher at the bottom of a chair or table. |