| X, x (noun) | 1 the twenty-fourth letter of the alphabet. 2 (algebra) the first unknown quantity. 3 (math) the first coordinate. |
| Xanthophobia | fear of the color yellow (see list of phobias) |
| Xenoglossophobia | fear of foreign languages (see list of phobias) |
| Xenophobia | fear of strangers or foreigners (see list of phobias) |
| xenophobia (noun) | hatred of foreigners and their ways. |
| Xerophobia | fear of dryness (see list of phobias) |
| Xerox™ (verb) | to make photograph copies by machine (xeroxing the documents for each of the committee). |
| Xmas | short for Christmas. |
| X-rays (noun, plural) | electric rays that are able to pass through solid substances and so can be used in photographing broken bones, or other objects hidden behind a solid surface. n X-ray an X-ray photograph. vb X-ray to make an X-ray photograph of. |
| Xylology | study of wood (see list of branches of science) |
| Xylophobia | fear of wooden objects or fear of forests (see list of phobias) |
| xylophone (noun) | a musical instrument of hanging wooden bars that give notes when struck with a wooden hammer. |
| Xyrophobia | fear of razors (see list of phobias) |
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