| English | Abbr. | French | Spanish | Portuguese |
|---|---|---|---|---|
| Armored blenny, blenny | blennies armées | blénnidos armados | Xenocefalídeo | |
| xanthochromic | xanthochromique | |||
| xanthophore | ||||
| xantophores | xanthophores | |||
| xBASE | xBASE | xBASE | ||
| xenobiotic | xénobiotique | xenobiótico | ||
| xerography | xérographie | xerografia |