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• X-Xz

• "X" Article - Dictionary of American History
• "X" as a Signature - West's Encyclopedia of American Law
• X - Contemporary Musicians
• X - A Dictionary of Architecture and Landscape    Architecture
• X - A Dictionary of Computing
• X - World Encyclopedia
• X - The Oxford Dictionary of Phrase and Fable
• X - Concise Oxford Companion to the English Language
• x - The Oxford Dictionary of Abbreviations
• X Chromosome - Genetics
• X chromosome - A Dictionary of Biology
• X chromosome - A Dictionary of Nursing
• X chromosome - The Oxford Pocket Dictionary of Current English
• X consumer - A Dictionary of the Internet
• X Prize - Space Sciences
• X Prize Foundation - The Columbia Encyclopedia, Sixth Edition
• X Rating - West's Encyclopedia of American Law
• X Rays - Gale Encyclopedia of Cancer
• X Rays - Gale Encyclopedia of Children's Health: Infancy through Adolescence
• x ref. - The Oxford Dictionary of Abbreviations
• X Terminal - A Dictionary of Computing
• X user interface - A Dictionary of Computing
• X Windows - A Dictionary of Computing
• Xī Jiāng - Concise Dictionary of World Place-Names
• Xánthi - The Columbia Encyclopedia, Sixth Edition
• x'd - The Oxford Dictionary of Abbreviations
• X, Malcolm 1925-1965 - Contemporary Black Biography
• X-1 Plane - Dictionary of American History
• X-chromosome - World Encyclopedia
• X-chromosome - A Dictionary of Plant Sciences
• X-chromosome - A Dictionary of Zoology
• X-craft - The Oxford Companion to World War II
• x-height - The Oxford Dictionary of Abbreviations
• X-linked disease - A Dictionary of Nursing
• X-linked lymphoproliferative syndrome - A Dictionary of Nursing
• X-ON/X-OFF - A Dictionary of Computing
• X-OPEN - A Dictionary of Computing
• X-plan diet - A Dictionary of Food and Nutrition
• X-rated - Oxford Dictionary of Rhymes
• X-rated - The Oxford Pocket Dictionary of Current English
• X-ray - World Encyclopedia
• X-ray - Oxford Dictionary of Rhymes
• X-ray - The Oxford Dictionary of Abbreviations
• X-ray - The Oxford Pocket Dictionary of Current English
• X-ray astronomy - A Dictionary of Astronomy
• X-ray background - A Dictionary of Astronomy
• X-ray binary - A Dictionary of Astronomy
• X-ray bright point - A Dictionary of Astronomy
• X-ray burst - A Dictionary of Astronomy
• X-ray calorimeter - A Dictionary of Astronomy
• X-ray diffraction crystallography - A Dictionary of Earth Sciences
• X-ray fluorescence - A Dictionary of Earth Sciences
• X-ray fluorescence spectrometry - A Dictionary of Earth Sciences
• X-Ray Glasses - How Products Are Made
• X-ray nova - A Dictionary of Astronomy
• X-ray photography - A Dictionary of Earth Sciences
• X-ray powder photograph - A Dictionary of Earth Sciences
• X-ray pulsar - A Dictionary of Astronomy
• X-ray screening - A Dictionary of Nursing
• X-ray source - A Dictionary of Astronomy
• X-ray spectrometer - A Dictionary of Earth Sciences
• X-Ray Spex - Contemporary Musicians
• X-ray telescope - A Dictionary of Astronomy
• X-ray Timing Explorer - A Dictionary of Astronomy
• X-ray transient - A Dictionary of Astronomy
• X-rays - The Oxford Companion to the Body
• X-rays - A Dictionary of Nursing
• X-rays - A Dictionary of Astronomy
• X-report - The Oxford Companion to World War II
• X-series - A Dictionary of Computing
• X-tgd - The Oxford Dictionary of Abbreviations
• X-Windows - The Oxford Dictionary of Abbreviations
• x.c.l. - The Oxford Dictionary of Abbreviations
• x.rts - The Oxford Dictionary of Abbreviations
• x/nt - The Oxford Dictionary of Abbreviations

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